I've been curious about that, too.
Basically, the game has been re-released with the 2K on the front cover packaging instead of THQ.
I don't even know if the one change that I expect, THQ's logo being replaced by 2K's in-game was done to the game.
I don't plan to find out as i'm not ditching my current copy for the new one to find out, but I do plan to keep on the look out for any conversations anyone else online is having to see if anything has changed.