I watched Olbermann last night and noticed how much smaller the new studio is.
Aside from the window in the background looking out on New York (which he joked about by saying, "And now it's time to take a look at the weather," at which point he turned around and looked out on the city below), the set looks somewhat similar to the old Letterman set from his NBC days.
Haven't seen the NBC Nightly News set, since they're broadcasting from the fires in San Diego.