The exciting thing about Rockstar games is not that they have the most advanced technology behind them, the best stories, or the most avant-garde game systems. It's the extraordinary amount of work the studio invests into the little details that make up its big worlds. Red Dead Redemption's dynamic horse testicles (they shrink when it's cold) are a frequently-cited example of that commitment to the particulars.
A pair of videos purported to be leaked GTA 6 gameplay surfaced online today, and if they are legit (the immediate copyright takedowns suggest as much), they seem to confirm that GTA 6 is more of the same. The short clips obviously can't express the full scope of Rockstar's designs—and we don't know how recent they are—but there's nothing in them to indicate that GTA 6 will reinvent the open-world crime spree.
