From The Official Star Wars Blog:
"The Night At The Museum returns, but this time everyone’s running around the Smithsonian. In this trailer, we see many returning characters and a new one from a galaxy far, far away.

Pharoah Kah Mun Rah (played by The Simpsons Hank Azaria) mocks Darth Vader’s cape and more..."

You can see a video clip here, and find out more about the movie here.