A PC release of GTA V was listed on Amazon’s German and French sites. The listings contained no information regarding release date and said it would be compatible with Windows 7 and Vista.
Rockstar have not confirmed a PC port is coming but they have confirmed that they were considering it. The French listing has been taken down but the German listing is still up.
GTA IV got a PC release seven months after it came out on consoles which would mean we’d see GTA V on PC around Spring time if Rockstar are keeping to this plan.