Yesterday I got a copy of the latest British magazine called PC Gaming World (from GameSpot.co.uk) and it had an article about all the new F1 games etc, Including Grand Prix 3.
There were no new screenshots, but there was another interview with Nick Court (senior producer of Grand Prix 3).
He stated that: 'The main improvements over GP2 are massive AI and Physics improvements, and if you lose a wheel - you will be able to see it go bouncing down the track'.
He also said that 'the drivers AI can be unique - we tried to look a their different states during a race and how they will perform in any different race situation'.
Sounds interesting - I hope he is correct!