This is 10 days old news, but nobody posted, so I will.
As a trademark filing hinted at back in August, Valve announced DOTA 2 today, a sequel to the first game made popular as a Warcraft III mod released in 2003.
DOTA 2 is being developed by IceFrog, an independent developer hired by Valve back in 2009. DOTA 2 promises to put a unique spin on the gameplay, which encompasses real-time strategy and role-playing game elements.