Valve has today announced DotA 2, a sequel to the hugely popular real-time strategy title that began life as a Warcraft III mod.

The brief press release says only that the game will be coming to PC and Mac in 2011, and that the sequel will expand on the original “in every way.”

The game is not officially entitled “Defense of the Ancients 2” as there’s a trademark dispute over the title between Valve and the DotA-Allstars company.