Capcom has announced (via Andriasang) that Xbox360 owners will get the first batch of DLC for Dragon Dogma's in advance of PS3 owners. The first patch of DLC for the game will provide gamers with eight additional quests. Furthermore, Xbox360 owners who don't have XBL gold membership can use all of the game's online features.  
It has been announced earlier this year that Xbox360 owners who are going to buy Dragon's Dogma will be able to play Resident Evil 6 demo first starting on July 3 while PS3 owners will have to wait until September 4 to access the demo, provided that they too purchase Dragon's Dogma.