This news came via a tweet from insider Jason Schreier, commenting that brand-new projects from big-budget studios would likely aim for the next generation of PlayStation. And this makes more sense with this context in mind. Console lifecycles typically range from 5 to 7 years long, so keeping Rockstar as the example, if it launches Grand Theft Auto 6 within the next couple of years, that would be in the middle of the current console lifecycle, and based on the company's track record for the past decade, the next planned game would come out during the next generation of consoles.
