There was supposed to be a native Mac version and it's not been 100% ruled out yet, although it's looking less likely by the week. We can only hope and pray the Russians get their act together. I'm pretty sure should it ever come about, it will use Steam play.
The DRM stops it running on a Virtual machine eh? That's lame. I guess boot camp might be the only option for now (which, in fairness, would probably give you way better performance, and the game in places needs as much as it can get...)
Sorry the news is no better.