(Yeah the new Audi's are incredible!)

And they were trying everything to cut the balls of them, weren't they?

The Diesels aren't banned but they restricted their fuel-tank size. They also have to refuel slower than non-diesels (not by design but by regulation) and they have a new +30kg weight increase restriction just for diesels.

There might be more. I suppose its not a bad thing to try to equalize the cars for racing by putting handicaps (and thus leaving it up to the drivers skill) but I dislike the outright banning of certain technologies.[1]