No unfortunately there won't be a mac version anytime soon.

I wish I could do one, but right now MoI uses several Windows specific stuff for certain parts of its UI, it will be quite a lot of work to port to the Mac. I just don't have enough resources to do that quantity of work anytime soon.

If you have an Intel Mac, you can run MoI by using BootCamp to boot to Windows on your machine.

Also, within a few weeks or so there will be a new 3.0 version of Parallels which is supposed to support 3D graphics (http://www.parallels.com/en/news/id,11647). If that works well, then that will be a way to run MoI as a window on your regular Mac desktop without needing to reboot with BootCamp.

- Michael