Microsoft's senior VP of Interactive Entertainment, Don Mattrick, has said that Grand Theft Auto IV will have downloadable content and online multiplayer support that's unique to the Xbox 360. If true, the news of exclusive Xbox 360 multiplayer elements would be quite a blow to PS3 owners.

"It's an amazing piece of software, and I'm really excited with its downloadable content and online multiplayer support - again, that's something that's unique to 360," he said.

"We think consumers are going to love that, and it's going to create what I would describe, again, as the premium experience on our platform."