apparently this has been said by mean fiddler:

Two of the headliners are British, but only one is English. The other is American.

Two of the headliners have met Homer Simpson.

Two of the headliners are due to make much anticipated comebacks next year.

One headliner might seem a bit surprising but they’ve done it before, one headliner has been obvious, but one headliner will shock a lot of you.

ALSO

Just to make things a little more interesting, I’ll give you clues for the top four each day using their nationality:

Friday:

British
English
American
Australian

Saturday:

American
English
British
American

Sunday:

English
American
British
American

i would say the smashing pumpkins are a dead cert to headline.