Iced Earth? Look at what Glenn has said...
1. It may be controversial.
2. Sonata is the festival headliners and Saturday would be a co-headline position.
3. Sometimes you have to create headliners instead of booking headliners.
4. you think the band doesn't deserve that high of a slot
5. you think Primal Fear is a bigger band and deserves to close out the night (screw the Rage Effect risk).
Not a single one of these statements would be true of Iced Earth. And most likely none of these statements would be true of Fates Warning or Symphony X.
Although I wouldn't mind Brainstorm, I doubt it's them. I get the sense (from Glenn's comments), that negotiations have been dragging on with the Saturday night closer. And I'm guessing Brainstorm would jump at the chance to close out the festival, given how well they were received here last time.
Edguy would be a complete disappointment (for me). They've been here twice and their headlining performance was no where near as entertaining as their #3 slot performance. That said, they're a way, way better live band than Primal Fear, and from that stand point, would have no issue following them.
Zod