Bit-Tech published a feature looking at what the future holds for Ageia's PhysX PPU

Maybe Unreal Tournament 3 will be that game which first crosses the line between simply providing extra eye candy and providing a fundamentally different game experience with a must-have status, but we won’t know it until the game is released and this is what really illustrates the problem Ageia faces; without a string of must-have games set up to use the PPU, few gamers will risk investing in a new piece of hardware, but with few gamers willing to invest in the hardware it still remains to be seen if enough of the big developers are willing to take the plunge and develop games which will require the PhysX hardware.

The Laws of PhysX