Some 'contradictory' views on next years cars (though not from Ferrari) but there are some hints about development being centered around the diffusers and fuel tanks as scarbs has pointed out.
Martin Whitmarsh interview
Q: With only two races to go the focus must be on the 2010 car. How far along is that process?
MW: The car is very developed. Aerodynamically it is already superior to this car because we were able to work with the regulations as they are now being interpreted. So one can imagine that there is a relatively extreme double diffuser system
on the car and it is quite a radical departure from this year’s car. We’re spending all our development resources on that project and it looks exciting. We will have a very competitive car next year, because frankly if not, you can’t win a championship as we did this year.
Brawn has a bit of a conservative stance.
I think conceptually the car is not so different next year but it's a non refuelling car so the fuel capacity is higher, the tyres are different.
"But the things we are doing aerodynamically now we can carry over to next year so it's not such a dramatic change. I think also everybody knows where they should be targeting.
"So we know what performance we have this year, we know what we should try and achieve next year, whereas some of the teams came in to this year not really knowing where they should be. I don't think it is quite as challenging next year as it was from 2008 to 2009." http://www.autosport.com/news/report.php/id/79298