Interestingly enough, even though the Halo anniversary didn't come to PC the Fable one is... Is anyone a little peeved to be honest? I would have liked to play the Halo 1 and 2 anniversary's.. even if that was all we got.. Fable can already look fairly nice at high resolutions..
The fact that the Halo games aren't on PC yet doesn't mean they won't. Microsoft has shown increased interest in PC gaming lately, so there's a possibility the Halo franchise can return to PC. The problem is however, Halo is the only reason some people buy an XBOX, so having it on PC could decrease the amounts of XBOXs sold drastically.