The original quote:
Quite why GI thought this is a realistic scenario is beyond us, luckily, R* today cleared up the rumour (via Kotaku) saying:
"We're not talking about new DLC or a collection of previously available DLC, we're talking about a full retail game. We expect this title to follow the suit of previous GTAs and use a subtitle such as GTA: San Andreas, etc. Tokyo might be a possible setting for the game, but details are non-existent at this time." - Game Informer Issue 190
With DLC keeping GTA players engaged until late 2009, we can't see a new, full GTA game being released until at least 2010, in all likelihood I personally think we're looking at 2011 as the best guess for now. That's of course assuming GTA V is coming...
there is "no truth" to reports that a wholly new retail game, one on par with the scope of Grand Theft Auto: San Andreas, will arrive before the holidays.
Sources: R* say no GTAV [Kotaku], original rumour [PSU]