As it turned out, Microsoft used the term "Exclusive" generously during their keynote. Rise of the Tomb Raider has a limited exclusivity to Xbox, though they neglected to use the word "limited".
This, however, wasn't the only "exclusive" they seem to be untrue about. Gaming site Centrumher.eu was playing the demo of Ori and the Blind Forest alongside a younger gamer, when that copy crashed out into Windows.
That's right, the Xbox One exclusive Ori and the Blind Forest was running on a Windows PC with a GeForce graphics card. Despite the controller being apparently connected to the Xbox One beneath the screen.