U2 and Beyonce for Glastonbury?

There's still no official word from the festival. Previously, organizer Michael Eavis said, "There's an American artist that I've been wanting to have for years and yonks and yonks and yonks," according to NME.com. Could he have been talking about the R&B/pop singer? Beyonce was at Glastonbury once before, in 2008, when her husband Jay-Z headlined, but she has never performed there.