I heard this a couple weeks ago and at the time it was total speculation but there may be legs to this story.
From www.mirror.co.uk on Dec. 31, 2007:
Looks like Led Zeppelin's appetite for rock is well and truly back.
We can exclusively reveal that the legends — who staged a triumphant "one-off" gig at the O2 this month — will be the headline act at the Bonnaroo festival in the U.S. next year.
The festival runs from June 12 to 15 in Tennessee — and if all goes smoothly they may even hit the road and tour.
An insider told us: "This is the news that will drive their fans absolutely wild.
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