Definitely agree with Slr on a full replay mode possible with editing options and the ability to upload online.
Better AI who don’t break far too early:
A better penalty system, and the ability to give back a place before being given a penalty if you overtake illegally.
Parade lap (Tyre sim mode) which forces you to heat up your tyres and also means there’s a much bigger variation in terms of traction off the line.
For Xbox 360: More achievements like the ‘is Jenson going to pass or not’ Such as getting 15 pole positions in a row (Doing a Vettel) Ect.