Some fans believe there's a chance Grand Theft Auto 6 is pretty much complete and the studio is now just polishing the game off, at least according to some recent theories. With the enormous success of GTA 5, fans are crossing their fingers that Rockstar is getting ready to divulge more information about the long-awaited follow-up. The sixth installment has allegedly been in development for years now, and people are waiting to learn when they'll be able to get their hands on it.