Speaking in this Reuters report, analysts Michael Pachter and Edward Williams have both said that they expect GTA IV will help move more PS3 hardware than Xbox 360s.
If sales come in at the high end of that range, the game will directly spur sales of 2 million additional PS3s in 2008, versus 1 million Xbox 360s, reckons Michael Pachter, an analyst with Wedbush Morgan.
"I think PS3 'wins' this battle," Pachter said...
"So many people who owned the PS2 went into PlayStation family because of 'GTA'. The release of 'GTA4' could expedite their decision to upgrade," said Edward Williams, an analyst with BMO Capital Markets.
More through the link.