The cynical developer inside me thought, "Windows 8 has so little traction among Windows developers, Redmond is trying to attract Apple developers out of desperation."
Ya, but look at it from a pragmatic business perspective, and this is Microsoft doing exactly what they should to court the prodigal developer: set up a zero hassle Windows environment on your favorite platform for cheap.
Haha, true. But it's a whole lot better than "Buy shitty VM product, then source a retail/whitebox copy of Windows, then Install and Patch, Install and Patch, and set up Dev tools for about $400."