We are currently looking into getting a Mac build of the Demo going, but there's still some setting up that needs to be done. We also need to asses how many people actually want Shattered Realms on Mac, otherwise we might be spending to much time on porting rather than improving the game.
And I'm guessing the fact that you didn't even mention Linux means that it's not even in consideration. That's a bummer, but I wish you the best regardless.