I feel sorry for people playing this on PC
Its gonna take a bunch of processing power to play portal 2
Dynamic lights, dynamic fluid, bumpmapping
Hey, the PS3 and Xbox 360 have mediocre specs compared to the average PC of today. So, I'd feel bad for the people that have to play this on consoles Because they'll either have toned down graphics, lag, or both.
Also, the waters just the same old flat plane with a water shader on it. It's not dynamic.
http://www.youtube.com/watch?v=uxSo1k2Y1Uk#t=0m29sUnless you're talking about that orange goop, in which case isn't fluid. They're just metaball particles which give the easy illusion of water. Metaballs are easy to simulate and are not processor heavy.
And bump mapping and dynamic lighting is old technology. We've seen it in L4D and such.