I don't get why people act like there's a difference between the type of metal that plays Warped and the type that plays Mayhem. There's a ton of sharing. 2008 had Black Tide and Underoath, 2009 had Bullet for my Valentine, 2010 had Norma Jean and Atreyu, 2011 had Straight Line Stitch and Suicide Silence, 2012 has The Devil Wears Prada and Asking Alexandria....
Yeah, I'm not seeing much of a difference. Both BMTH and Chelsea Grin are very possible but it's definitely way too early for speculation.