Yeah with the possible exception of System of A Down none of those first-tier bands were ever do Mayhem Fest. I think something like a Rob Zombie/Deftones co-headliner would be solid and bring back two legit side stages instead of having some label half-ass a second stage with the shittier bands from their label.
1/7 August Burns Red/Protest the Hero
2/19 Tove Lo
2/24 RUN THE JEWELS