"graphical overhaul" means improving the visual appearance or quality of something, usually referring to a computer game or software. It involves making the graphics or images look better by updating or enhancing them. Full definition
While it hasn't been a major graphical overhaul from previous entries it has definitely been optimized, and it shows. (playstationlifestyle.net)
This year's big addition is, of course, the huge graphical overhaul and a new lighting system that can be seen in all parts of the game. (gamingnexus.com)
Add to that the great graphical overhaul and the additional features and what you get is a fantastic title that is worth your money. (totallygn.com)