Trine is one of those indie-game-that-could stories and so it delighted me to find out that Frozenbyte is creating a follow-up with Trine 2. Slated to release on Steam next month, Trine 2 will feature gorgeously-rendered visuals, much like the previous title, but in addition feature a 3-player co-op mode that lets you and your friends play simultaneously. As the game was originally about simultaneously controlling 3 different archetypes and using their various powers to solve physic-based puzzles, this sounds like a natural progression for the franchise.
More interesting to me is the promise of cross-platform multiplayer between PC and Mac players. Not a huge leap in the multiplayer world, but its a start for what Valve is trying to do with Mac gamers. The next thing I would like to see is some support for these types of games between PC, Xbox and Playstation.