How will the once and future king of "Late Show," Stephen Colbert, appear when he arrives at this exalted place sometime in 2015? We get a hint tonight, when he appears on "Late Show with David Letterman" as .?.?. himself. And Himself doesn't look a whole lot different from his Alter Ego Self: Same voice, same tie, same wicked-fast wit.
Check out this clip that was just released.