It looks like it's true although I haven't seen any links to anything official. They also list Throwdown as being on the bill.
There's this mention over on the Evergrey board:
http://www.ultimatemetal.com/forum/showthread.php?t=231950&page=2
That's the second page because it's got more info than the first. They only mention Colorado Springs for my area. I prolly won't make that trip. Hopefully they'll do a Denver show too. It's only an hour more up the road.