Daily News: Construction is underway at the Ed Sullivan Theater for the “Late Show with Stephen Colbert,” and plans call for a state-of-the-art studio to be completed by the Sept. 8 premiere. “The entire theatre has been totally gutted,” said an insider. “Everything has been stripped down to the bones. The seats have been removed, the carpets are gone. Nothing is left except a concrete floor and exposed concrete walls. It will look nothing like ‘Letterman.'”