Shack PSA: ModNation Racers Goes Double XP
Additionally, in the comments SCEA San Diego community manager Ramone Russell reveals that information about new DLC, including potentially items for track creation--new props and the like--and character customization items will be "coming soon."
ModNation Racers was released on May 25 on the PS3 and PSP. This double XP promotion will only affect the PS3 version.