Yes, when programming on it will start an (official) announced will be made.
The decision isn't whether or not we want a Mac version... we do.
It's whether we want to build it ourselves, or give the finished HM2 code to a third party team of programmers to build it for us.
So the decision will be made, shortly after the official release of HM2. (based on how well HM2 sells, and how much time the programmers have to spend on other projects)