The reason Led Zeppelin is appearing on Letterman this Monday night, is not only to help plug in the “Celebration Day” BluRay/DVD/CD release, it is also because Letterman is being honored at the Kennedy Center today too, along with Zeppelin.
We ALL know Letterman is going to ask them about an upcoming tour, and maybe Led Zeppelin will finally squash the tour speculation. Still though, the band could confirm a tour by saying, “Yes, we’re doing it”, out of the blue, just to put out an unexpected surprise. They could be keeping that confirmed tour top secret from us, all along, but I doubt it, though. So don’t get your hopes up. They’re probably gonna deny a tour, again for the 100th time. They’re probably just gonna talk about the Cebebration Day release, the Kennedy Center honors, and the career of Led Zeppelin.
Of course, there’s a possibility, they might perform on television too, so keep our fingers crossed on that.
Kev
K'Brocking 
Than for the heads up. I don’t stay up that late (or TiVo {does that still exist ?} so will wait with bated breath for a report.