I think late 2025 is realistic.
People say we should have seen more by now if it was coming out next year, but I think when you are GTA you don't really need to bombard people with trailers and footage so far in advance.
If we look at what they did for GTAV on the Rockstar Youtube page:
- They had the first reveal trailer in Nov 2011 (a bit under 2 years before launch). Similar to the one we got for 6, where they focus on the vibe by showcasing in engine environments,
- The next trailer was a character highlight focusing on Michael, Trevor and Franklin uploaded in April of 2013 (5 months before release)
- The actual proper gameplay reveal trailer with the woman describing the game and mechanics was uploaded in July of 2013 (2 months before release)