There isn't an Mac version planned at this time. More details on this subject can be found
in this FAQ thread.
Quote:
Unwise choice. Macs are ONLY good for video editing to my knowledge..
This is what is known as "flame bait". 
Macs are great for a lot of things but sadly they've got the short end when it comes to games. As a big Mac Fan (and ex-Mac Developer), I hope Apple can figure out a way to solve this problem but I'm not holding my breath.
