I saw somewhere on Halford's forum that there's going to be a special guest at this show and that it's being recorded. The obvious guess would be K.K., but maybe it'll be someone like Les Binks!
Edit: Screw phones, I didn't mean to put a thumbs down on this post.
Flotsam & Jetsam and/or War Master - 7/9
Grindcore Fest - 7/12
Exodus - 7/25
Impaled (?) - 8/15
Sleep - 8/30
Swans - 9/10
King Diamond - 10/31