I'd personally just like quality of life things really, and more things to do endgame. Using GTA 5 as an example, some of the things in Online like having vehicles delivered to you, insuring them, etc could've enhanced the Story Mode imo. Another area that could do with some attention is the controls, especially when in first-person. Perhaps the biggest thing they could give us would be greater freedom in how missions can be completed, rather than them being almost completely linear.
As for your other point. I think it will be a good game, but undoubtedly overhyped.
