Even though I wasn't going to go to this as I'm across the country, it still saddens me to hear they won't be playing. They are (were, again? still?) a fantastic band.
Not thrilled with the fact that they gave no explaination though. That's pretty lame. I could be a little less affected if it was a band that is still active, but to tease the fans like this by saying you're bringing one of the most influential metal bands back from the dead at the arguably biggest true metalfest in America; only to back out and give no explaination as to why; is pretty low.