I'll be absolutely gutted if I don't get to see Metropolis or Learning to Live, especially since both have been played on this summer tour.
They're my 2 favourite songs, so I really want to see at least one of them live at some point, but I've got a horrible feeling they might have been dropped from the sets by the time they get to Europe again.
Aside from them, I'd also really like to see Under a Glass Moon and Endless Sacrifice from the sets they've been playing recently. I love TCOT, but I saw that at Prog Nation 2009, so I wouldn't mind seeing that dropped since it's so long and would make way for a few shorter songs maybe.
Other personal favourites I'd love to see would be:
Octavarium
In the Name of God
ITPOE
ACOS
The Glass Prison
Sacrificed Sons
TMOLS
I imagine quite a lot of the set will be taken up with the new material, so I won't be holding my breath for anything close to my perfect setlist
But I won't mind what I get as long as Metropolis or LTL make an appearance