I'm still wondering if any "timed" deal about the exclusivity extends to other consoles or the PC. I hope of course that this game will eventually go to other consoles, but the way Darrell Gallagher worded it, makes me think it's kind of exclusive for the Xbox, and probably will end up on PC. On PS4 - I'm not that sure yet.
On the other hand, the fact that they are kind of beating around the bush and not confirming that it's exclusive Xbox all the way, probably is a dead give a way that the deal in fact is timed and that there will be a version on other platforms eventually.
As a huge Tomb Raider fan (well used to), it kind of brings back a few memories. Tomb Raider was the reason why I bought a PlayStation. I played it on my PC first (which was too slow to run it nicely and eventually, I bought into the convinience of owning a console like the PlayStation). I don't think the new Tomb Raider reboot has that selling power as the original did back in 96, but it's still a very big well known and successfull franchise - as evident by the outrage over its exclusivity deal.