Buzz News Roundup, 12/17

• Jay Leno and Conan O'Brien will return to the air Jan. 2. The Futon Critic has Conan's full statement along with Jay's take.
• Meanwhile, David Letterman is working on a plan to bring his show back — writers and all, writes The Hollywood Reporter.
• The release date for the Bryan Singer/Tom Cruise film Valkyrie has been pushed back from July 4 to October 2, Variety reports.
• Jon Favreau and country music stars Tim McGraw and Dwight Yoakam are joining the cast of Four Christmases, which stars Vince Vaughn and Reese Witherspoon, writes ComingSoon.
• Billboard has new details on Alanis Morissette's new album, which will bring together folk, world, and experimental pop music.
• The American Film Institute has named its top movies and TV shows of 2007, USA Today reports, including No Country for Old Men and Friday Night Lights.
• NBC has set a February premiere date for Quarterlife, the online series it's re-purposing for TV, Zap2it reports.
• According to Variety, Emmy Rossum will star in Dragonball, the movie based on the Japanese manga.

Photos courtesy of NBC