To say the obvious, no they did not. Rise of the Tomb Raider will be as exclusive as Ryse and Dead Rising 3. Considering the fact that Microsoft has been considering the option of selling off the Xbox division, I doubt that it would be feasible for Microsoft's gaming division to pay enough to get true exclusive right. Maybe console exclusive if not just timed.
I remember when there were question over whether Alan Wake would make it to PC. The only true exclusive left are game that one of the big there pays for from beginning to end, such Bayonetta 2. I am quite confident that by December 2016, there will be a version of Rise of the Tomb Raider on PC if not also the PS4.
Games I have Finished