My predictions:
No QOSTA
No Will Smith
Vampire Weekend and Khruangbin taking sub spots, maybe coheadlining one night
Charlie and Chappel headlining 2 nights
Amelie Lens and Justice closing Main Stage after Charlie and Chappel.
Papa Roach, Nelly Furtado and Idles playing 7pm slots at Main Stage.
So my prediction for Main Stage is:
Nelly/Vampire Weekend/Khruangbin
Papa Roach/Charlie/Justice
Idles/Chappel/Amelie Lens