According to a source close to Rockstar North, the team is working on exclusive supplemental content for both systems, which will be made available for download via Microsoft and Sony's respective online services after the game's release next year.

"Think of the world as a large island - the new downloadable areas will be like smaller islands linking into it," the source explained. (Which is a structural analogy, rather than a suggestion that the game is set on an island, we hasten to add.)