Microsoft has done a fantastic job getting the most notable content of the 360 era on backwards compatibility. Given they have to get approval for the games added, expectations were low on what they could get. However, hundreds of notable games have come and I believe they've exceeded the expectations of many.

Ideally everything would be emulated, but that's not gonna happen and getting notable games is most important. In a recent article I saw backwards compatibility ended in 2018 with 550 games in total, with over 100 added in 2018. So what's left to be added? But more importantly what does BC really need that people are demanding and the remaining gems.

In my list there might be games that seem like odd additions or some notable content ignored. Some games were ignored because superior versions exist as ports, but some previous gen versions of games remain on the list because the updated releases were disappointments or the original versions are still worth having for various reasons.

I think this list will also put into perspective what content could come. Perhaps MS isn't that far from adding all the games we are really asking for.

Xbox 360 - Notable games; possible or likely additions to BC.
1942: Joint Strike
Ace Combat 6: Fires of Liberation
Ace Combat: Assault Horizon  
Akai Katana
Alpha Protocol (MS owns the developer, but Sega likely owns the game.)
Army of Two: The 40th Day
Army of Two: The Devil's Cartel (This game sucks!)
Assault Heroes (CLASSIC!)
Asura's Wrath
Bangai-O HD: Missile Fury
Batman: Arkham Asylum
Batman: Arkham City (Remasters of Arkham games are considered inferior.)
Batman: Arkham Origins Blackgate
Battle Fantasia 
Beautiful Katamari
Binary Domain
Bionic Commando
Bionic Commando Rearmed
BlazBlue games (Honorable mention)
Bomberman: Act Zero (Crucial Xbox 360 release.)
Call of Duty: Classic
Call of Duty: Black Ops III (Other cross-gen CoD are games on BC.)
Call of Juarez
Castlevania: Harmony of Despair (Interesting game at best)
Charlie Murder
Command & Conquer games All four games added.
Conan
Condemned 2: Bloodshot
Costume Quest
Crackdown 2
Dark Sector
Dark Souls II (Differences from 8th gen version I believe.)
Darkstalkers Resurrection
Dead or Alive 4
DeathSmiles 1 and 2
Dust: An Elysian Tail
Enslaved
Eternal Sonata
Far Cry Classic
F.E.A.R. series (All four games on Xbox 360)
Fez
Forza Horizon 2 (Not a direct port of X1 version)
Grand Theft Auto V (Why not?)
Gun
Hitman HD Pack
Homefront
Hydrophobia
Infinite Undiscovery
Kane & Lynch: Dead Men
Lost Planet series (Capcom probably wants this dead.)
Magna Carta 2
Majin and the Forsaken Kingdom
Max Payne 3
Medal of Honor
Medal of Honor: Warfighter
Mini Ninjas
Mortal Kombat
Mortal Kombat Arcade Kollection
Mortal Kombat vs. DC Universe
Nier
Ninja Blade
Ninja Gaiden II
Ninja Gaiden 3: Razor's Edge
Ninety-Nine Nights games
Phantasy Star Universe (Unlikely to happen, but has offline campaign.)
Prince of Persia: The Forgotten Sands
Project Sylpheed
Quake II
Quake 4
Quake Arena Arcade (Forgotten, but should have been on my list.)
RayStorm HD 
Remember Me
Resonance of Fate
Resident Evil: Operation Raccoon City
Rez HD 
Ridge Racer 6 (Another game I forgot.)
Risen 1
Risen 2
Risen 3
Rock of Ages (Forgotten, but should have been on my list.)
Samurai Shodown: Sen (Very low odds this will happen.)
Sega Superstars Tennis
Serious Sam games
Shank (Only the sequel is on BC)
Singularity
Skate series
Skyrim (I want to continue my save on BC!)
Sonic & Sega All-Stars Racing
Soulcalibur IV
Soulcalibur V
South Park Let's Go Tower Defense Play!
Star Ocean: The Last Hope
Street Fighter X Tekken 
Super Street Fighter II Turbo HD Remix (Unlikely due to Ultra Street Fighter II)
Syndicate
The Chronicles of Riddick: Assault on Dark Athena (Includes original game)
The King of Fighters XIII
The Last Remnant
The Saboteur 
Turok
Two Worlds series
Unreal Tournament 3
Viking: Battle for Asgard
Viva Piñata: Party Animals (Probably the most important game that wasn't on my list.)
Warhammer 40,000: Space Marine
Zeno Clash games

Xbox 360 - Notable but unlikely to be added for licensing reasons.
50 Cent: Blood on the Sand
After Burner Climax
GoldenEye 007: Reloaded (All 007 games really)
JoJo's Bizarre Adventure HD Ver.
Lollipop Chainsaw (Music licensing?)
Marvel vs. Capcom 2: New Age of Heroes
Marvel vs. Capcom Origins
Naruto: Rise of a Ninja
Naruto: The Broken Bond
Project Gotham Racing 4
Scott Pilgrim vs. the World: The Game (Won't happen given remaster was released.)
Teenage Mutant Ninja Turtles (classic arcade game)
Teenage Mutant Ninja Turtles: Turtles in Time Re-Shelled (I enjoyed it)
The Simpsons Arcade Game

COULD NEVER FUCKING HAPPEN!
Too Human

Original Xbox - Notable games; possible or likely additions to BC.
Advent Rising
Arctic Thunder
Area 51
Baldur's Gate: Dark Alliance (Unlikely given remaster.)
Baldur's Gate: Dark Alliance II (Will probably get remaster as well.)
Blinx 2: Masters of Time and Space
Blood Omen 2
Bloody Roar Extreme
Blood Wake
BloodRayne
Brute Force
Burnout 3: Takedown
Call of Cthulhu: Dark Corners of the Earth
Call of Duty: Finest Hour
Call of Duty 2: Big Red One
Capcom Classics Collection Vol. 1 and 2 (Unlikely because Capcom keeps releasing new compilations.)
Capcom Fighting Evolution
Capcom vs. SNK 2 EO (Available on PlayStation)
Castlevania: Curse of Darkness (Surprisingly good)
Cold Fear
Darkwatch
Dead or Alive 3
Dead or Alive Ultimate
Dead to Rights II
Destroy All Humans! 2
Deus Ex: Invisible War
Dino Crisis 3
Dragon's Lair 3D: Return to the Lair
Fable
Fable: The Lost Chapters
Fatal Frame
Fatal Frame II: Crimson Butterfly
Freedom Fighters
Gauntlet: Dark Legacy
Gauntlet: Seven Sorrows
Grand Theft Auto - 6th Gen Trilogy (Feeling very unlikely with the botched remaster)
Gunvalkyrie
Halo: Combat Evolved (Simply so people can play Halo classics untouched.)
Halo 2
Hitman games
Hunter: The Reckoning: Redeemer
Indigo Prophecy
Kingdom Under Fire: Heroes
Kingdom Under Fire: The Crusaders
Kung Fu Chaos (1st party greatness)
Legacy of Kain: Defiance
Manhunt
Marc Ecko's Getting Up: Contents Under Pressure
Max Payne
Max Payne 2: The Fall of Max Payne
MechAssault
MechAssault 2: Lone Wolf
Medal of Honor games
Metal Slug 4
Metal Slug 5
Midtown Madness 3
Midway Arcade Treasures series (Very unlikely due to greatness and other compilations)
Mortal Kombat trilogy of 6th gen (Not great games, but not terrible.)
Mortal Kombat: Shaolin Monks
Oddworld: Munch's Oddysee
Oddworld: Stranger's Wrath 
Otogi 1 & 2 (Notable OG Xbox exclusives)
Phantasy Star Online (Very unlikely to happen, a remaster seems more likely if anything.)
Prince of Persia: The Two Thrones
Prince of Persia: Warrior Within
Psi-Ops: The Mindgate Conspiracy
Rayman Arena
Red Dead Revolver
Return to Castle Wolfenstein: Tides of War
Sega Soccer Slam
Serious Sam II
Silent Hill 2
Silent Hill 4: The Room
Silent Scope Complete
Sonic Heroes
Sonic Riders
Spartan: Total Warrior
Spikeout: Battle Street
Star Wars games (MORE!) (More were added)
State of Emergency (Unlikely given the theme)
Stubbs the Zombie in Rebel Without a Pulse
Sudeki
Super Monkey Ball Deluxe
SVC Chaos: SNK vs. Capcom
The Bard's Tale
The Suffering games
Thief: Deadly Shadows
TimeSplitters 2
TimeSplitters: Future Perfect
ToeJam & Earl III: Mission to Earth
Tom Clancy games
Turok: Evolution 
Unreal Championship 1 and 2 (We only got 2)
Unreal II: The Awakening (They probably want to forget this happen.)
The Warriors (Available on Playstation consoles.)

Original Xbox - Notable but unlikely to be added for licensing reasons.
Crazy Taxi 3: High Roller (Music licensing)
Def Jam: Fight for NY (Was available on PSP before the store shutdown.)
Jet Set Radio Future (Music licensing)
Jaws Unleashed (You play as a shark, a licensed shark.)
OutRun 2
OutRun 2006: Coast 2 Coast
Scarface: The World Is Yours
The Punisher
The Simpsons: Hit & Run
The Simpsons: Road Rage
Tony Hawk's Pro Skater 2x (Unlikely given the great remakes.)
Tony Hawk's Pro Skater 3 (Will probably get a remake as well.)
X-Men Legends 
X-Men Legends II: Rise of Apocalypse

I want Resident Evil 4.

I refuse to pay for it again.

I had it on GC, Wii and 360.

Jurassic Park: Operation Genesis matters, but unlikely to happen due to licensing.

I have a few dozen games that I would like to see made BC, but you have covered them all pretty much.

Timesplitters would be great,  the silent hill games are in the collection tho (it is the not the best version oh well)

I hear ya, but Capcom's record has been remastered (or planned for remaster) games don't get on BC.

For what its worth you can find RE4 cheap whether it be during a deal or a used physical copy. I like having the X1 version because 1080p/60 fps versus 720p/30 fps on 360. But I think the 360 version is interesting for using the original Gamecube assets.

Silent Hill 2 and 3 are in the HD collection and bad port jobs. Original Xbox had 2 and 4. So at the very least I imagine they would add Silent Hill 4 to BC.

However, if they can add OG Xbox's Silent Hill 2 I think fans would like that. Digital Foundry considered that a notable port.

If ssx 3 could get ported, I think jsrf could, too.

Anyway, great lists!

EA seems to be an exception when it comes to licensing deals, kind of like movie companies. They seem to have the ability to keep selling products. You can buy old Need for Speed games, Burnout games, Fight Night games and other old titles using licensed content.

That's why I see Def Jam NY as a potential addition. This may actually be a matter of whether or not EA wants to do it. EA is also motivated to have more EA Access content which I gladly subscribe to.

Thanks, I'm getting the impression people mostly agree this is the content BC needs. If MS adds another 100+ games in 2019 to BC, it will hopefully be many games found in this list. BC is also a big chunk of Game Pass content. So that's a motivator for MS to keep adding games to BC.

I would like some KOEI Games: Samurai Warriors 1 & 2, Dynasty Warriors 5: Empires, Warriors Orochi 1 & 2.

Samurai Shodown Sen would be good to. All this games i have the physical copy but they are not on the backward compatibility.

I'm not quoting you because of the weird box thing you added to your post doesn't play well with the forum.

Anyhoo, I own Akai Katana and I suppose it could be added.

Unless they want to start giving other users worldwide access to Japanese exclusives, those games don't matter.