The hardware is ready for the PhysX card, but Ageia is waiting for some of the studios to finish their games before releasing the PhysX card. No point in having a PPU without anything to use it on.
The scheduled date of release is sometime February, 2006 (thats now
). I believe Asus and BFG are going to be the exclusive makers of the cards, atleast for a while.
This thing frees up the CPU, BIG TIME. As in, if you're getting 10FPS on a Physics-enabled game, this PPU will let you have 50FPS.
No idea how much it'll cost, but I doubt it'll be less than $200.