What for. There is hardly anything to do with physics in this game and all of it can be done by the CPU. I hope it is software based instead of hardware because physx is so poorly optimized for non physx computers. HL2 EP2 will probably still have better physics.
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The PC version is coming in January 2009 - As to the PhysX, it will be used to add realism to the game - You have weather/wind effects, moving cloth, flags, but to be honest it won't be absolutely needed - but in any case i'm ready for it. It uses the Unreal 3 engine - and the one disappointment is that the game is ridiculously SHORT - 10 hours gameplay at most, and much less if you're good. The only thing that puzzles me is WHY the devs decided on using flash animations for cut scenes, instead of using the game's engine - it really doesn't look good when you are playing the game with its U3 engine and all of a sudden switch to cartoon mode - doesn't look good.