There's never any news when it comes to the PC versions, but they always do, usually a few months after the console version. So it'll be july to september maybe, don't know why the OP is worried about running a game so ahead on current hardware.
I think we have a long wait for for this. I saw a rumor that the the UK release will be April 25th on PS3 and Xbox 360. This is interesting though, becuase usually only PS carries GTA (and it seems to be the source of the delay). In the past, GTA3, Vice City and San Andreas took 6 months to make it to PC after console release. At least both console systems are dx9 based, a 3850 will have no trouble.
I just saw they are bringing back multiplayer as well, ala GTA1/2!