One thing to keep in mind here that you might not realize is that the people who founded superfly productions and bonnaroo are old school baller phish heads who know the band and are the same people who originally master minded and organized the early phish festivals. The two parties have a long history of working together and throwing some amazing events.
So I am sure they at least asked the band to make an appearance and that the boys would at least consider it as a hat tip sort of thing if nothing else. Also they have all played at roo with various bands so they are no stranger to the scene and the sit ins and all the great tunes and I think they would be into it. I think it is gonna happen and its gonna be a total mob scene and I might even be there. we shall see though.