I just want my terran buffs xD

Same here. No LAN isn't a big deal for me.

Some new details on the evolution system, TBH sounds very close to Wings of Liberty TBH, they just swapped money for "mutagen" 

StarCraft II: Heart of the Swarm Evolution Chamber And Battle Focus Details

An introduction to Evolution Chamber and Battle Focus and all the features those mechaics have to offer in the upcoming StarCraft II expansion pack.

Evolution Chamber

In case you have played StarCraft II: Wings of Liberty, then you are introduced to the mechanics of armory. In Heart of the Swarm expansion pack, Zerg version of armory will be called Evolution Chamber where new units will be unlocked during the campaign play and upgraded with various of bonus features. Currency that is spent in the evolution chamber is mutagen and is acquired during the missions by completing various goals and objectives. In the current version of the game, 6 mutagens are required to fully upgrade a unit while there are total of three upgrades available for each of them.

Zergling

Metabolic Boost – Movement speed increased by 33%.
Posthumous Mitosis – A 20% chance of after dying to spawn 2 broodlings.
Rapid Genesis – Zerglings are trained instantly.

Evolution:

Swarmling – Hatches three swarmlings instead of two zerglings, the third comes at no extra cost.
Raptor - +10 HP, and leaps into battle.

Notes: While the swarmling does not cost extra minerals, it does take up food. A raptor’s leap is similar to a zealot charge, and while it does not explicitly state a cooldown, it does in fact have an internal cooldown. The wings attained through metabolic boost are smaller and less visible, only after evolution does it appear completely. The swarmling’s wings are a slight neon green, while a raptor changes its whole body color to a purple/pink texture.

Roach

Chitinous Plating - +1 armor.
Bile Ducts – +2 damage.
Organic Carapace – Health regeneration increased by 2

Evolution:

Prowler – Enables burrow movement.
Leech – Every unit killed gains the leech 10 HP (up to a maximum of 60). Also, Health regeneration increased.

Notes:The prowler is no different than a fully upgraded roach in WoL. Take note that each second evolved unit listed here is a recolor of the first. A leech has a purple tint to the regular brown of a roach.

Baneling

Viscous Discharge – Upon impact, slows the target by 25%.
Centrifugal Hooks – Movement speed is increased by 25%.
Rupture – Splash radius increased by 25%.

Evolution:

Splitterling – The baneling now splits into smaller explosive units when killed.
Gorgeling – After exploding, the gorgeling returns a sum of minerals and gas on the floor.

Notes: The splitterling breaks into two twice in its lifetime. Big (40HP/20dmg) becomes Medium (20HP/10dmg), and then becomes Small (10HP/5dmg). The gorgeling is basically a purple/pink baneling, and the minerals/gas are automatically granted through impact.

Battle Focus

Battle Focus is the main menu screen where player can customize Kerrigan's abilities. This is a place where all the mentioned RPG elements of HotS that were announced by Blizzard Entertainment can be seen. You can see Kerrigan's stats, specialization, skills and other. Player gains skills and stats by obtatining an infestation level. Once Kerrigan obtains enough points, she levelups and gains extra HP, energy, armor and additional damage. Two various battle focuses are currently available to Kerrigan, Spec Ops and Corruption.

Spec Ops (+50 Energy)

Pulse
Energy Cost: 50
Cooldown: 10 seconds
Description: Deals light damage to all targets in a 2.5 tiles radius. Also stuns the units for 3 seconds.

Psionic Shadow
Energy Cost: 50
Cooldown: 30 seconds
Description: Kerrigan creates a Psionic Shadow of herself that deals half damage.

Infested Cortex (Unlockable)
Energy Cost: Passive
Description: Grants Kerrigan an additional maximum of 50 energy.

Corruption (+3 Armor)

Corrosive Spores
Energy Cost: 50
Cooldown: 10 seconds
Description: Target all units in a 2.5 tiles radius, all units receive an additional 3 damage. Lasts 15 seconds.

Spawn Broodlings
Energy Cost: 50
Cooldown: 10 seconds
Description: Kills the target. The target spawns 5 broodlings upon death. Massive/Heroic units are immune.

http://www.gamersbook.com/scene/news/starcraft-ii-heart-of-the-swarm-evolution-chamber-and-battle-focus-details/