For what its worth Lamb of God is touring the US this summer playing amphitheaters... I have a hard time seeing LoG headlining in amphitheaters. Considering Metallica likes taking them out maybe it is summer tourdates. You would think only playing 2 shows in the east would be something they do with the Big 4 but last we heard more shows weren't likely to happen this soon according to Kerry King.
1-13 Philip H. Anselmo & The Illegals