Minecraft – Do natural structures generate above 128 blocks

We are running a Minecraft server (bukkit) with new version 1.2. The height limit was doubled in the release, but I can't find any natural structures that use the new space above 128 blocks. I found some jungle trees and mountains that are 122 blocks height, but nothing above 128.

Does the map generator generate natural structures higher than the old 128 block limit?

Edit:

A source for your answer would be nice. (The code of the part of the generator that limits the height, or a seed to proof structures above 128 blocks)