The official announcement saw plenty of brilliant acts confirmed for the June event, and while we’re definitely excited to see the likes of FKA Twigs and Mark Ronson perform, we can’t help but wonder who the special guests might be.
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Ian Brown's band are favourites to perform
Perhaps, we’re reading into it too much, but the fact the poster states ‘guests’ seems to suggest the act will be a band, and the bookies agree.
Other acts to make their shortlist include Taylor Swift - who’ll be in town with her ‘1989’ tour the week Glasto takes place - and Blur, who are already scheduled to headline Isle of Wight Festival in early June.
Who else could it be? See all the odds from Paddy Power here, and check out some of the possible options below...
Glastonbury: The Third Headliner...
(01 of10)
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Eagle-eyed fans are wondering whether the Glasto poster's moon logo could be a reference to the rock legends. They've turned down multi-million pound offers before - has Michael Eavis managed to make them reconsider? (credit:Classic Rock Magazine via Getty Images)
(02 of10)
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Could Queen and Adam Lambert be heading for Somerset? Brian May has refused to confirm - or deny - the rumours... (credit:Greg Allen/Invision/AP)
(03 of10)
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Paddy Power have named Stone Roses as favourites to surprise us as sunday night headliners. (credit:John Shearer/Invision/AP)
(04 of10)
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Taylor Swift has a Glastonbury-sized gap in her '1989' World Tour schedule, and Michael Eavis has stated that he'd love the singer to perform at Worthy Farm. Watch this space... (credit:Greg Allen/Invision/AP)
(05 of10)
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After weeks of speculation over a possible secret set at 2014's festival, Prince and his band didn't perform there. Could 2015 be the year? (credit:Suzan/Suzan)
(06 of10)
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Rockers Muse are being tipped by bookmakers. (credit:Sharon Latham/Manchester City FC)
(07 of10)
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If Oasis ever reunite, surely Glastonbury would be the perfect place to do it? (credit:ASSOCIATED PRESS)
(08 of10)
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Well, if Beyoncé can... (credit:Mark Davis/NBC via Getty Images)
(09 of10)
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Coldplay's seventh album is in the works, and rumour has it that Chris and his bandmates could be heading for the Pyramid Stage once again. (credit:Powers Imagery/Invision/AP)
(10 of10)
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Florence and the Machine are already on the line-up, and it's possible that the band will occupy the closing slot, meaning the special guest wouldn't be a headliner after all... (credit:Scott Roth/Invision/AP)