Grand Theft Auto 6 Footage Leaks

A post on the GTAForums reveals that over 90 videos are now online allegedly revealing gameplay from Grand Theft Auto 6, the next installment in the open-world crime series. The individual who posted these suggests they possess source code and may leak a test build at some point: "Its [sic] possible i [sic] could leak more data soon, GTA 5 and 6 source code and assets, GTA 6 testing build." A tweet from Jason Schreier supports the authenticity of the videos. Jason has previously commented on the legitimacy of rumors about the open-world crime series. He confirms the new footage is bona fide:
Not that there was much doubt, but I’ve confirmed with Rockstar sources that this weekend’s massive Grand Theft Auto VI leak is indeed real. The footage is early and unfinished, of course. This is one of the biggest leaks in video game history and a nightmare for Rockstar Games.