Apparently 3 continents are already booked and the tour will go on for 2-3 years. Gene has said he can do this until he's 72.
Paul has not discounted past members being onstage during this tour...though I should imagine that it will only be for select dates.
I wonder if they will advertise in advance where past memebrs will be appearing (and who it will be), or just have them as surprises?