I've noticed a distinct increase in the quality of the render as well as noticable speed increase....no image yet as I'm still in torture testing but soon, it seens to use similar instancing to Vue because IIRC Vue will show amizong increse in poys in a scene with a population added indicating they aren't true instances...I think Terragen2 uses true instancing because I've never locked it up and have had 15 000 000 grass plants at once with 3 cloud layers which with a lot of polys, will lock the girl right up.. ...

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again