I was in game this evening, looking around at the changes. The new terrain features look better than the old ones. Especially with the roads disappearing on steep slopes. I think I noticed that run speed is a little slower than it was before, both on and off roads.
Went out to the big island, that is a large mountain on it. I didn't see any trees or junk yards, though there was a nice harbor/lagoon. If it doesn't change, it won't be a sustainable location for tribes in prelude, at least until boats are added.
Another thing I noticed with terrain is that everything seems a little taller, slopes steeper. Some places it is more apparent than others, basically the higher the terrain the more dramatic the elevation change.
Edit - The waterfalls are nicer too, smooth across the tops.