I'm pretty sure this is just a hoax... one designed to promote the bands that are listed so far.
I mean, really, think about it. If you decide to check out these bands, cause maybe enough people compare them to someone you do know (like Nightwish), Mission Accomplished. Kamelot will probably never be "confirmed", that's just part of the ruse.
I'm sure the whole thing will fall apart as time goes on... tickets, which are supposed to go on sale this winter will slowly be pushed back... then venues will slowly be unconfirmed... then eventually, the whole thing will eventually disappear a year from now. But the promoter (who deserves credit for the Blair Witch Project -type marketing) will never admit to it.