Jay Leno to replace Conan at 11:30?

We’ve learned Jay’s 10:00 PM show will go on hiatus February 1. After the Olympics, Jay will take back his 11:30 PM time slot. What has not been decided — whether Jay’s show will be a half hour, followed by Conan, or whether Jay’s show will be an hour and NBC says sayonara to Mr. O’Brien.