It appears that Noble Team will be making its PC debut next month. The store page for Halo: The Master Chief Collection was temporarily made live earlier today, and it listed a 12/3 date for the PC port. An extensive list of achievements have also appeared on Steam Database. (The Xbox One version of Halo: Reach may even drop as early as tonight, as the release date has been changed to November 14.)
343 Industries promised Halo Reach and the start of the MCC’s launch on PC by the end of the year, so either of the tweaked dates would fulfill that promise. It would obviously be a straightforward positive PR move for Xbox to throw this new update out tonight, too.