While this at this point in time, an ABBA reunion for Glastonbury is merely hearsay, it's at least educated hearsay.
According to a report on Gigwise, bookmakers ("bookies" in American slang) William Hill are setting odds at 33/1 that ABBA will play the Glastonbury festival, scheduled this year for June 22-26 in Somerset, England. This comes in the wake of ABBA singer Agnetha Faltskog saying she would consider reuniting with the group sometime in 2011, possibly for the Royal Wedding of Prince William to Kate Middleton. Mama Mia! (Sorry.)
William Hill's odds for a possible ABBA one-off London reunion this year went from 100/1 to 20/1 amid growing reports and speculation. Place your bets now.