During the Gamescom 2015 Press Conference, Blizzard reveals first details for the Allied Commanders mode in StarCraft 2: Legacy of the Void. This new mode allows player to be legendary StarCraft commanders. Each commander has their own play style and abilities, as well as new cooperative powers exclusive to the Allied Commanders mode. Now there are three commanders which could be playable at gamescom:
For more imformation about new allied commanders mode, visit StarCraft 2 official site.