Physx on GPU was already available at the end of June. The only difference is that whereas previously you had to download the Physx system software seperately, now it is integrated within the drivers.
The fluid demo looks really nice and performs quite smoothly on my system. A pity the most interesting features (changing colour/rendering and fluids moving objects) are not currently available in Dark Physics.
Theory is when you know something, but it doesn't work. Practice is when something works, but you don't know why.
Programmers combine theory and practice: Nothing works and they don't know why.