Puzzle-based action/platformer Trine 2 is coming out this week, and developer Frozenbyte has announced that the Mac version will drop alongside the Windows version on Steam. If you want to get a copy outside of the Steam system, you'll have to wait until sometime next year, but even with the "DRM," Steam is usually a good choice to go with, even on a Mac.
Frozenbyte is of course no stranger to Mac gaming, having just recently released a solid bundle for the Mac (as well as other platforms like Windows and Linux -- which is actually getting Trine 2 later on anyway). Trine 2 is looking like a really terrific game, expanding on the first title in the series by
