The new scenery looks beautiful, WTG HTC.
The only non-turnoffable extra feature I've seen so far is the decreased tile size of the terrain. PCs will have to draw a lot more triangles and this can't be turned off as all players have to see the same thing. Set against this though, the new version will use the Shader 3.0 feature of your video card, moving a lot of processing from your CPU on to a currently unused part of your video card. So it is even possible the new version might run better on lower PCs than this one....time will tell.