Unless they gave them money to release the game on their console with new features, which they probably did.
bingo. I'm not gonna pretend to be an expert on the business, but pretty sure that's how exclusives work. 3rd party devs don't just release it only on one console cuz they feel like it, they do it cuz they're getting paid extra.
I have to say I'm more than disappointed by this as a die hard Deus Ex fan I feel like it's a slap in the face to the people that made it a success. It would be nice if they could simply patch the game as is on Steam without us having to re-buy the game. I don't feel it's asking a lot. New game plus and better boss fights are something the PS3/360/PC crowd have been wanting since release.
Have the game on ps3 and now that i have a deebt rig I would buy a directors cut version in an instant for it. The revamped boss fights sound really good and I hear they even touched up the graphics a bit.