i dont believe for a second that a band of the size of green day today would announce shows for july next year in the same year.
that account is all BS if you ask me
Looking at the Milton Keynes gig on YouTube, I think that Chase & Status could easier headline the Other stage. Would be epic if it was a live set and they brought out other artists.
Whether they will do it though as they have a big outdoor London gig TBC for next year.