I heard this morning on KEXP (Seattle indie station) that these artists are playing Sasquatch this year:

Bjork, Beastie Boys, Arcade Fire, Interpol, The Blow, The Hold Steady, Neko Case, The Black Angels, The Dandy Warhols, Ghostland Observatory, M.I.A, Bad Brains, Two Gallants

There were more, these were the ones I remember