This is the best thing to come out of E3 so far, of cause microsoft paid good money to have it at there stage. In fact most of there games they showen are coming to the PC. If I was a publisher, I wouldn't lock any exclusivity with the XBone. It seems a bit too much like Windows 8.
Its also coming to the PS4 but why would you touch those locked machines when you can have a DRM FREE version on the PC which supports mod tools and improved graphics ?