La noticia esta en ingles pero dice que se encontró una linea en el codigo fuente que confirma el juego para PC y PS4,les dejo la nota entera
Grand Theft Auto 5 was already leaked onto torrent websites yesterday for the PlayStation 3 and Xbox 360 platforms and now, after some digging, fans have found references to both a PC edition of the game and a PlayStation 4 versions, both already hinted at by retailer listings in the past.
GTA V is the most anticipated game of the year and developer Rockstar has kept on re-iterating that the game will appear only for the PS3 and Xbox 360 at this point in time.
After several leaks from different retailers, it seems that GTA 5 will also appear for the PC and PlayStation 4, at least according to source code found on 4chan, via Reddit.
The references include code for a PC configuration of the game, as well as a reference to another platform called Orbis which, in case you forgot, was the codename of the PlayStation 4 for some time before its reveal this year.
As of yet, Rockstar hasn't commented on this massive leak.