All looks like it'll be very easy to get used to if you've got a D200. So a couple of left side buttons have moved around and maybe a couple of extra menu items to accomodate extra features, but that's about it for ergonomic changes.
A very good thing in my opinion because I find the D200 already pretty close to perfection in terms of ergonomics.
What I really like to see are sample photographs though, besides the occasional pirate one where you don't really know if it's legit, or whether it's from a production model.