Vangough might be a good replacement since they are an American band that would fit the opening slot.
Thank You Scientist are touring with Haken at the moment, though I'm assuming the plan is to bring in power for power.
Of course, Imminent Sonic Destruction would be a great choice and they are touring with CM and Acsendia!
Damn, I know a lot of folks were amped for GloryHammer. Well, it'll be interesting to see who gets the slot.
That was my first thought when I read that. They'd have been a great fit there also and have a new Cd out on 9/2