Tonight's episode of The Tonight Show marks the 50th anniversary of that venerable franchise. There will be clips and surprise guests…and also a very surprising announcement. Everyone had figured that Jay Leno, workhorse that he is, would stay in that job forever, or at least until he'd beaten Mr. Carson's record of a little over 30 years behind the desk. Not so. Jay will announce that he will host the show five more years — until 2009 — at which time, he will step aside and Conan O'Brien will take over. This is obviously some negotiated compromise having to do with NBC not wanting to lose O'Brien, and it's quite unprecedented in television. I can't recall when any network ever locked themselves into something five years in advance. They're always aware that trends can change, stars can fade or emerge, etc.
More on this as it develops. But you heard it here first.