A Rockstar Mayhem Festival admat has began to leak with a rumored lineup similar to names previously leaked out. The official word is still supposedly coming on April 13, 2015, but the lineup reportedly includes:

Slayer
King Diamond
HELLYEAH
The Devil Wears Prada

Victory Records stage:
Whitechapel
Thy Art Is Murder
Jungle Rot
Sister Sin
Sworn In
Shattered Sun
Feed Her To The Sharks
Code Orange
Kissing Candice