Sources familiar with the matter told Kotaku that GTA 6's development is slowing down and it could result in the game being delayed by another year. However, Rockstar still wants to launch the game in 2025 and will only postpone it as a last resort. https://www.notebookcheck.net/GTA-6-release-window-could-get-pushed-back-to-2026.816571.0.html
By the time this game comes out, AI will already be able to make AA games at minimum.