Obviously not too much terrain in here...

I made the "city"-model in 3ds max using several instances of the famous "greeble"-modifier which procedurally creates square shaped structures on objects and lets you assign different map channels to different object groups inside the main object randomly. Fun stuff!
Since I am a member of the alpha team as well, I had the opportunity to use the brandnew "population-on-objects"-feature to create the trees on top of the model. I can assure you, this is a fantastic new feature and it didn't take much longer to populate this quite dense mesh than it would take on a regular terrain.
The clouds receive shadows from surfaces, so it took quite some time to render.