I'd give my left nut for another Ihsahn appearance. Past couple of years have been a little more consistent - which isn't an inherently bad thing, but I'm ready for some 2011-2012-like variety. I understand that's probably not an exceptionally popular opinion but I really enjoyed having some heavier acts here and there. Also? Ne Obliviscaris. Having seen them live twice now I feel absolutely confident they'd do well at PP.