Here's an article of Lazlow from the GTA game's.
http://www.gta4.net/news/4074/gta-iv-goes-gold--lazlow-speaks-on-gta-iv--new-screenshots/
He prefers the 360 version for the DLC and shed's some light on what that is;
Between the Xbox 360 version of the game and the PS3 version, Lazlow admits that he prefers the 360 version thanks to the downloadable content; new missions, new characters, new comedy, etc.
So i guess that's what it's going to be.