There is quite a large cast in addition to our Harry Potter regulars, but with a film of this magnitude, it should be expected.
Harry Potter and the Deathly Hallows: Part I is in theatres November 19, 2010. Part II is in theatres July 15, 2011.
P.S. Will The Twilight Saga: Breaking Dawn Parts 1 and 2 have great trailers like these or such a stellar cast? No.