After the announcement of the PC version we finally have the first screenshots and information. The biggest difference will be the graphics. The PC version will look a lot sharper with a maximum resolution of 2560x1600. Also the Replay feature is back and a video tool will help create videos out of the game, these videos you can upload at Rockstar Games Social Club (or still at GTAinside).
Go to the "Related Links" to see the screenshots.