Stephen Colbert will make his debut on CBS' "Late Show" Tuesday — only the second person to serve as permanent host of the franchise created by David Letterman in 1992.
There are some details known about Colbert's show. His first guests will be George Clooney and GOP presidential candidate Jeb Bush. His first musical guest will be Kendrick Lamar. His band will be led by Jon Batiste.
But there are also many unknowns. TheWrap looks at the biggest questions left unanswered heading into Tuesday night's premiere.
1. How long will he reign?
The day after Conan O'Brien premiered as host of "The Tonight Show" in 2009, NBC issued a press release proclaiming him "the new King of Late Night." Seven months later, O'Brien was unemployed.
CBS won't make that mistake after Colbert debuts Tuesday night. Expect him to draw huge ratings on his premiere night, though not so huge as Jimmy Fallon did for his "Tonight Show" debut in 2014, which benefited from an Olympics lead-in.
For his first few episodes, Colbert will likely siphon off audience from Fallon and ABC's "Jimmy Kimmel Live!" and draw curious viewers who don't normally tune in to the broadcast late-night series.
But after two weeks, the numbers should settle into something that will resemble the new late-night ratings normal — a competitive three-way race between Fallon, Kimmel and Colbert, with Colbert providing a legitimate challenge to Fallon's hold on the top spot.