Yes, it's actually coming out, on November 18th (or 21st in Europe). On one hand, it's a shame, as it kills a good conspiracy theory in the head - though now does make me wonder why they haven't given us Bully yet. On the other hand, it's awesome, as it's GTA4... on the PC. It's genuinely a lovely game and it makes me a tad depressed I bought a year's worth of Gold Membership for the 360 so I could play it multiplayer, and now I'm just going to play it on the PC instead.
That'll teach me, eh?