It's official: Valve's new game is Dota 2, which takes its name from the popular "Defense of the Ancients" Warcraft III mod. Gameinformer.com broke all the details, and it looks like the game will be coming to PC and Mac in 2011.
Dota 2 will be instantly familiar to any Dota player because Valve hired IceFrog, the developer behind DotA-Allstars, to act as the creative force behind the upcoming game. However, Valve's Source engine will instantly make Dota 2 stand out from its predecessors while retaining that cartoony feel.