2007 was heavily marked by lack of PC-centric games and exclusives, a trend that had been continued since the beginning of 2000. However in 2008, PC gaming is looking to resurge and stand up on it's feet.
From revival of exclusive established franchises such as Starcraft, Jagged Alliance, Disciples (strategy), Dracula, Simon the sorcerer (adventure), Far Cry, Chrome, American Mcgee's (action) , Jumpgate (simulation), mixed with new interesting IP's and great multiplatform games will provide a superior entertainment for strategy nerds, adrenalin junkies, adventure fanboys and roleplaying tards.
PS: The list isn't complete. gonna work on it a while longer. Will also cover the multiplats and such.
Out of the list exclusive games, the AAA titles(hopefully) are: Starcraft 2, Empire: Total War, Spore, Sins of the Solar Empire, Gray Matter, A Vampyre Story, Dragon Age, Guild Wars 2, WoW: Wrath of Lich King, Warhammer Online, Farcry 2.
The 2008 EXCLUSIVES
STRATEGY
Starcraft 2
Do I really need to explain why?
Empire: Total War
Finally! Total War is heading into XVIII century. After Rome: Total War, another BIG Game is coming!
SPORE
One of the most ambitious games in development. Made by the genious Will Wright (Sim City, The Sims) 
Disciples III: Renaissance
Disciples II: Dark Prophecy was one of best turn-based fantasy strategy games of last few years. Now Disciples III looks bound to do the same, in full 3D.
Sins of the Solar Empire
Epic Space Empire Building Strategy with mix of Homeworld-like combat, and amazing visuals. Made by ex-members of Barking Dog(where they worked on Homeworld: Cataclysm)
Jagged Alliance 3
Jagged Alliance series is pure turn-based perfection. This mythical franchise is returning after 9 years of absence, for the delight of all Turn-based fans.
Worldshift
WorldShift is a cyber-fantasy RTS game for the PC. This game is looking out to be a good surprise for 2008.
Multiwinia
Multiplayer-centered version of Darwinia
Cities Unlimited
City Life turned out be a very good(7.8 from GS) city-builder that achieved quite nice financial success, so now Monte Cristo will follow it up with much bigger budget and possibly a new name.
Europa Universalis Rome
New spin off from Europa Universalis franchise
Warhammer 40,000: Dawn of War: Soulstorm
Third add-on to one of best modern RTS franchises
Seven Kingdoms: Conquest
New entry is likely the least known AAA series( Seven Kingdoms got 9.0 and it's sequel got 9.1)
Panzers: Cold War
Previous two Panzers games were both solid.
Sequel to one of most original RTS of recent years
ADVENTURE
Gray Matter
New adventure game from the empress of the genre: Jane Jansen (creator of Gabriel Knight series)
A Vampyre Story
From ex-LucasArts guys(mostly from the Curse of Monkey Island crew)
Heaven
This game promises great cinematic value and has Sexy all over it (watch Trailer)
Simon the Sorcerer 4
The beloved adventure series is back, this time in following the path of first two titles(which were incredible) instead of following the terrible road of Simon 3.
Treasure Island
3D adventure game from Radonlabs that will give you a chance to live through Stevenson's classic story. Look very promising!
Overclocked
An adventure game described as "present-day thriller game about the psychological dimensions of violence."
Sinking Island
Detective adventure game from Benoit Sokal(Amerzone, Syberia series, Paradise)
Still Life 2
Finally a sequel to one of most loved adventure games in recent years.
Alternativa
Cyberpunk adventure from makers of Memento Mori with non-linear story and alternative storylines. 
Perry Rhodan
Adventure game based on longest running SF novels series ever made
Memento Mori
New adventure game from Anaconda label.
Nostradamus - The Last Prophecy
"His last Prochey read: The Royal family is in danger" (amazing trailer)
Experience123
From makers of Missing: Since January. You play as observer, it is from this detached position that you'll need to assert your influence in order to guide Ai-controler woman through the challenges, using only the various controls at your disposal, none of which allow you to communicate verbally with her, though you can hear her speaking to you. By doing so, you will also uncover clues about the woman's identity, your relationship to her, and the mysterious circumstances in which you find yourselves.
The Whispered World
The screens are giving a big 'Spirited Away' vibe.
Nikopol: The Carnival of Immortals
Adventure game from Benoit Sokal (Syberia) based on Enki Bilal's (and with active input from the author) masterpiece graphic novel trilogy.
Dracula 3
The series is getting resurrected by Kheops.
Penumbra: Black Plague
Sequel to the scariest adventure ever.
Mata Hari
Designed and written by Lucas Arts veterans: Hal Barwood and Noah Falstein ( guys behind Indiana Jones and The Last Crusade as well as legendary Indiana Jones games The Fate of Atlantis)
Art of Murder: FBI Confidential
New adventure game from the team behind Schizm (7.8 from GS) and Sentinel (7.0 from Adventuregamers)
Memento Mori
New adventure game from Anaconda label.
RPG
Dragon Age
Bioware next epic
Guild Wars 2
Sequel to AAA online RPG
Space Siege
Sci-Fi action-RPG from GasPoweredGames, a team behind games like Dungeon Siege and Supreme Commander. Watch the cool trailer here (or the HD version here)
Reluctant Hero
An innovative RPG that follows entire career of your character, till his very death from old age. (Check this article to know what it's all about)
Drakensang: The Dark Eye
Finally a new game based of DarkEye pen and paper RPG (previously used in Realms of Arkania series)
King's Bounty: the Legend
SRPG. Player will walk around big world map, do quests, subquests ,upgrade his character, etc. Simply typical RPG stuff, but the combat will resemble a strategy game. It will be turn-based ,you will gather big parties etc.
Afterfall
RPG following the good old school principles of the genre: non-linearity, turn-based combat, lots of roleplaying and decisions having real effect on the game world
Not the Time for Dragons
Dropship
A turn-based Sci-Fi wargame with RPG elements developed by ex-Troika guys using the Source engine
The Broken Hourglass
An old-school Baldurs Gate 2-like RPG, done by Planewalker Games-indie team consisting of cRPG modders, lead by Jason Compton (the best BG2 modder, he did wonders to NPC and party members dynamic interaction). The game is set in Tolmira (sword-and-sorcery setting, which PlaneWalker licensed) has isometric perspective, unlimited party, complex party-to-party interactions, lots of good old-school roleplaying and real-time with pause combat system
Hard to be God
Isometric RPG set in world created by Strugacki's brothers. Co-developed by Akella
Legend: Hand of God
Seeker
Epic space opera RPG by LogicFactory, makers of ToneRebellion(8.1)
Mount and Blade
Indie RPG with revolutionary combat system(realistic swordplay, archery, mounted combat, total ownage)
Age of Decadence
Hardcore indie RPG
MMORPG
World of Warcraft: Wrath of Lich King
Second add-on to WoW. Blizzard eats Godzilla for Breakfast.
Warhammer Online: Age of Reckoning
by Mythic, makers of Dark Age of Camelot(one of the best MMO's ever)
Star Trek Online
Recycled Space Operas have never been better! A must for the fans. 
Ragnarok Online 2
Sequel to one of the most popular MMORPGs in the world
Dragonball Online
From Namco/Bandai, production is overseen by Toriyama himself!
Pirates of Burning Sea
A pirate MMO created by a team full of pen and paper RPG legends(like John Tynes)
The Chronicles of Spelborn
A promising MMORPG.
FPS
Far Cry 2
Far Cry 2 will most likely yet again push the boundaries of PC technology. The most free-roaming FPS franchise to date.
S.T.A.L.K.E.R.: Clear Sky
Prequel of S.T.A.L.K.E.R. (With various improvements over the first game, including added dx10 support).
Chrome 2
Original Chrome had alot of untapped potential, but ultimately didn't fulfill it due to several problems. Since then Techland has been consistently improving, and now Chrome 2 is targetting for a higher level than it's predecessor.
Global Agenda
Tactical MMOFPS running on Unreal Engine 3.0
Cryostasis
Innovative FPS from ( small team most well known for Carnivores(7.1) and Carnivores 2(7.3) )
Savage II: Tortured Soul
A sequel to innovative RTS/FPS mix that won Indie GOTY 2003
Ground Branch
Tactical shooter from Blackfoot( which is composed of RainbowSix, Rogue Spear and Ghost Recon leads)
Enemy in Sight
Tactical shooter from makers of Mafia.
Natural Selection 2
Commercial Source-based sequel to one of best mp MODS
Kwari
Online FPS from Microforte (makers of Fallout Tactics)
ACTION
Lone Wolf: Flight from the Dark
Action-adventure based on legendary "Choose your own adventure" gamebook series
Collapse
TPP post apocalyptic action game from Creoteam(new team formed mostly by ex Crytek and Frogwares guys)
American McGee's Grimm
Finally a follow up to Alice
Black Sky
Open ended StarControl2 like game
Zeno Clash
Fantasy First-Person Action game running on Source engine.
Audiosurf
Audiosurf allows you to experience the intensity and emotion of your songs in real time, in full color, and in 3D in form of futuristic racing game. One of finalist for IGF 2008 Game of the year award.
Captain Claw 2
The first one was one of most loved 2D PC platformers in recent decade
Hammerfall
Physics based action puzler.
PLATFORMER
Gish 2
A sequel to one of best 2D platformers of last 5 years( 8.2 at GS, IGF Game of the year 2005 winner)
Limbo
Indie platformer
Cletus Clay
A platformer with visuals made of Clay made by maker of Platpus
SIMULATION
Microsoft Train Simulator 2
Finaly a sequel to one best train sims ever made, this time it will be made by AcES (company responsible for Flight Simulator series) using their Flight Simulator X engine
Jumpgate Evolution
A sequel to space sim MMO that got 8.6 from Gamespoit
Infinity: The Quest for Earth
MMO space simulator with huge procedurally generated universe
Storm of War: Battle of Britain
From makers of Il2 Sturmovik
Digital Combat Simulator: Black Shark
Heli sim from Eagle Dynamics, best known for Flanker 2.0
Knights of the Sky
A WWI sim made on IL2Sturmovik series engine
Silent Hunter 4: U-Boat Missions
Add-on to submarine simulator
Universe Online
A space sim MMO from team of MMO veterans( Colony studios is composed of people who worked on Eve, Wow and others MMOs)
RACING
Live for Speed S3
Major upgrade to already great Live for Speed S2
iRACING
Ex-Lead guys from Papyrus(basically the GOD of racing sims until Sierra closed them down)are now working on self-funded online-centered hardcore racing sim to be released in 2007(official site)
MOTORM4X
offroad racing game from EasyCo (company formed by ex-members of IlussionSoftworks where they worked on Hidden and Dangerous 1-2 and Mafia)
PUZZLE
Subversion
Fourth Introversion game (after Uplink, Darwinia and Defcon)
Cosmic Osmo's Hex Isle
CYAN Worlds (creators of Myst series) are returning to the first IP they've created.
Overflow
New fluid-centered puzzle game from makers of The Odyssey: Winds of Athena
Katamari Online
Multiplayer spin-off of the great series
Crazy Machines 2
Puzzle game sequel, this time in full 3D
Crayon Physics Deluxe
Crayon Physics Deluxe is a sequel to the popular freeware game in which you get to experience what it would be like if your drawings would be magically transformed into real physical objects. Solve puzzles with your artistic vision and creative use of physics.One of finalist for IGF 2008 Game of the year award.
World of Goo
A physics based puzzle / construction game.One of finalist for IGF 2008 Game of the year award.
