Project Spark looks like it can be a lot of fun, but I won't be buying an Xbox One anytime soon, and have absolutely no interest in Windows 8. If they don't have a Windows 7 release, it looks like it's up to the pirate community to remedy the situation, as they did with Halo and it's Vista only requirement.
So if this fails on Win8, microsoft is just going to use it to further abandon PC gaming claiming it's dead? (I know this is just another of it's pushes to sell Win8 in addition to the bios lock on some OEMs)
Seems selling a failing OS every other term isn't their only pattern, they seem to make anticipated games for those crappy OS versions. Vista had halo 2, 8 has Project spark.