Dota 2, the MMORPG Valve’s been working on for a while now, has long been rumored to be F2p. Now it seems Gabe has confirmed those rumors.

"It’s going to be free-to-play — it’ll have some twists, but that’s the easiest way for people to think about it,"

http://www.valvenews.net/2012/dota-2-will-be-free-to-play-with-a-twist/