Here's a video from Gamespot from the Media Summit last week. It shows off the hub/observatory in Super Mario Galaxy as well as a part of the Honey Hive Galaxy we haven't seen.
Enjoy:
http://www.gamespot.com/video/915692/6181056/videoplayerpop?
Enjoy:
http://www.gamespot.com/video/915692/6181056/videoplayerpop?