Box Office Mojo reports that Revenge of the Sith will play in an estimated 3,700 theaters in North America, when it's release on Thursday May 19th, 2005. If the estimate holds, it will be the 10th widest release ever.

Here are some stats from Box Office Mojo on the other 2 prequels:

Attack of the Clones / 3,161 theaters
Opening Day: $30,141,471 (on a Thurs.)
Four-day bow: $110,169,231

The Phantom Menace / 2,970 theaters
Opening Day: $28,542,349 (on a Wed.)
Five-day bow: $105,661,237