Any videogame where you play as David Hasselhoff while he performs an abortion on a man is worth buying.

You can probably run Thief, but from my experience, the game isn't optimized too well, even for high-end PCs. I'm getting a lot of stuttering and framerate dips. It looks pretty impressive on max settings though.

I think it's more of a move to combat piracy than anything. It's possible to pirate games on the 360, but not the Xbox One (not as of now anyways). I'm sure there are plenty of factors other than "polishing the game for the 360."

I just hope that, when the game does release on the PC, it isn't a crappy unoptomized port like Grand Theft Auto IV was. That game is still running sub-par on my machine.

So much speculation... I don't think we're going to see Half Life 3 for a while, but one can hope.