Left 2 Die adds a "new co-op take on the StarCraft II campaign mission 'Outbreak'" and Blizzard DotA — which may actually be known as Blizzard All-Stars — appears to be an outer space spin on the popular WarCraft III mode, Defense of the Ancients.
All four mods are playable at this weekend's BlizzCon and will be released to the StarCraft II community, for free, via Battle.net in the coming months.
[Source: Kotaku]