The source also revealed that preliminary work has begun on Grand Theft Auto 6, but said a location had not yet been settled on.

It's not unusual that Rockstar would begin laying the early foundations for its next Grand Theft Auto so soon - It's been more than two years since the initial release of GTA 5.

As for the more immediate future, there's a lot of speculation that next Red Dead game will be revealed this year, but there's a big question over where it could be the first to use a new Rockstar engine. In 2012 Rockstar put out a job advert for a position working on engine development for next-gen systems.

"This is an exciting opportunity to develop cutting-edge architectures and high performance systems for current and next-gen platforms," it read, hinting that a new engine might be in the works. Even if Red Dead Redemption 2 doesn't use it, there's a very good chance that GTA 6 will.

We asked Rockstar for comment on this story but did not receive a reply. We'll update if we hear anything.