I was going to get the PS3 version anyway (controller preference) but this will be a nice bonus, I just hope the DLC is worthwhile.
I don't care too much about DLC, as evidenced by the fact I got GTA4 for PS3 instead of 360.
The only real games I've gotten DLC for are Rock Band, Guitar Hero and Motorstorm. If I ever buy Warhawk I'd get that DLC. I will be getting the new level for PAIN though.