Despite a persistent message occurring for some players in Grand Theft Auto Online, Grand Theft Auto 6 has definitely not been announced for a 2019 release.
Rockstar’s official support account on Twitter recently responded to user @KolosisYT, dismissing the message by saying, “This is a hoax made with the use of mods, and not an official message or statement from Rockstar Games.”
Source: IGN.com GTA 6 Has Definitely Not Been Announced for 2019