Well, “expected to launch” in spring 2013. That’s the language Rockstar Games used on its website, and as a company known for delaying games until they’re good and ready, it’s not surprising.
More information on GTAV should be available soon, as it’s supposed to be on the next cover on Game Informer, and one would expect that to begin the game’s official marketing campaign.
Today's announcement only mentions Xbox 360 and PlayStation 3, and nothing about a PC release. Grand Theft Auto IV was released for the PC, though, as was Max Payne 3 and L.A. Noire. People are still peeved about Red Dead Redemption not getting a PC release.