When companies produce games on a regularly basis - such as a yearly racing franchise - the changes tend to be incremental, rather than revolutionary. What matters, then, are how your new version improves on the last, even if the really big issue is the up to date teams, cars, and so on. That's precisely what Codemasters attempt to explain in the F1 2012 video below. They're really focusing on realism for this new game, and by gum it looks good. The weather is going to be so detailed that you'll have wet and dry conditions on the same track.
Cor. The game is out September 21st.