Mass Effect - there's rumours that they're already working on it. Rumour has it they're going to focus on the initial discovery of the relays and the first contact war instead of making a movie version of the game story. I think that is an awesome solution, personally.
Assassin's Creed - also coming.
Half-Life - But only if it's done well.
Baldur's Gate - I'd love to see that story in a proper, adult fantasy movie.