Free to Play, Valve's feature-length documentary following three top players competing for $1 million in the first Dota 2 championships, premieres online on March 19, directly on Steam. It's categorized as a "free to play" item, but a Free to Play Competitor's Pack for Dota 2 launches on the same day, and 25 percent of the proceeds from that bundle benefit the contributors and players in the film.
Free to Play follows Dota 2 players Dendi, HYHY and Fear as they prepare for and compete in the first installment of The International championships held in 2011. If you don't want to know who won, do not click this link. Valve announced the documentary in August 2012.
For those in San Francisco, Valve is holding a public screening of Free To Play at The Castro Theatre on March 18 at 8PM PT, followed by a Q&A with the creators and "special guests." Tickets run $25 apiece and are available here.