Are there any serious racing games done with PhysX? I donīt think so. Usually custom specialized driving physics engines get used for serious AAA racing games.

Which doesnīt mean that physics engines like Bullet, Newton or PhysX canīt do good car physics. On the Ogre3D website you will find some nice racing games done with Bullet and Newton. For example Tractor Cross and several Kart racing games.

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I would like PhysX because it's NextGen and has stunning features! I guess that the support of PhysX will bring a lot of new customers for conitec.
The term "NextGen" is a very silly marketing thing. Almost everything is the next generation of something. Like the name says Acknex is "NextGen" too for example. :p

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But I like the thought that we will be able to make use of the physX cards or even the new grafic cards with the physic processors.
Bullet and Newton for sure will make use of CUDA too in the future.