When Grand Theft Auto V was initially announced we at Neo added a PC forum for the game assuming that it was one of the platforms for the game. However, the PC announcement was no then made, has yet to be made, in fact. While no announcement has come today either, there has been a positive development. Three European Amazon sites put up a listing for the PC version of Grand Theft Auto V -- and have yet to take them down!
Again, an Amazon listing is far and away from any sort of official announcement. Like us when we created our forum, Amazon could just be making the assumption that Rockstar is 100% bringing Grand Theft Auto V to PC, just not yet. They like to delay it a bit , whether that be for console exclusivity agreements, anti-piracy measures, or because they hate PC development. If Amazon feels comfortable putting up a listing for it, you should be comfortable the game will be realized -- eventually.
Grand Theft Auto V is scheduled for a spring 2013 release for the Xbox 360 and PlayStation 3, but lots of people would like a PC version too. News should be coming sometime this week with the game's box art, but maybe they'll have a special announcement for PC gamers too.