UPDATE: Both Microsoft representatives and the Tomb Raider official tumblr are indicating that this is indeed a full exclusive rather than a timed one.
Crystal Dynamics and Microsoft has just announced that Rise of the Tomb Raider, the next big instalment in the Tomb Raider franchise, will be Xbox One exclusive. It'll be out next year.
This is probably the first real blow against the PS4 that Microsoft has struck this year.
We're still looking for clarity on whether this will be a full exclusive, or a timed one.