That was just a little something for you Gav ;P
I hope the derpy foliage in some of those screens is placeholder. Then again, foliage isn't a priority, maybe it isn't.
The new/optimized trees and terratexture definitely were not used in this prank update.
This is from 2008, so the trees and terra may yet look better.
Speaking of which, I hope they design plenty of varying in-game terratextures with the 3D/highly-detailed look like that grass. Or else using our own textures won't look cool like that haha. But yeah it's not one of the user priorities of course, that terra just looks fantastic.