The magazine describes the as-yet-unannounced title as a "full retail game," rather than simply new DLC or a compilation of previously released downloadables. Still, juicy as this is, we can't help but find this rumor somewhat difficult to swallow given that nothing about the project has been so much as whispered before now. However, if true, it seems likely that the game would follow previous releases and adopt a subtitle similar to GTA: San Andreas or Vice City. How about Sesame Street? What's the hooker situation like over there?
Update: Rockstar denial.