Really? Even with the introduction of the KERS system and the regs clamping down on the aero aides they are allowed to use.Considering the amount of changes and regulations coming in next year, pretty much every team will have a new engine, chassis and aero package.
Most of them are just improving what they allready have, Honda Are Re-designing the Whole Car From Scratch, This years car is the same base car as what they've used since BAR left them, which is why they've been slow, Next seasons car will be completely different.
KERS is Being Introduced next year, But That doesnt mean they have to Re-design the whole car, they are just adding to what they have, in some cases taking away to save energy and make F1 a 'greener' sport.