I haven't seen an official track list yet, so this is my theory on the breakdown of the set list on 3 CDs:
Disc 1
False Awakening Suite
The Enemy Inside
The Shattered Fortress
On the Backs of Angels
The Looking Glass
Trial of Tears
Enigma Machine
Along for the Ride
Breaking All Illusions
Disc 2
The Mirror
Lie
Lifting Shadows Off a Dream
Scarred
Space-Dye Vest
Disc 3 (with the Orchestra & Choir)
Illumination Theory
Overture 1928
Strange Déjŕ Vu
The Dance of Eternity
Finally Free
The first disc would run at about 73-75 minutes long, while the second would be about 40-45, and the third 45-50, depending on how much time they keep between songs, and the pre-encore applause/chanting, etc. etc.
If they cut out a lot of the between-song time, they could have easily sandwiched everything into 2 CDs, but I think they would've wanted to keep the Awake stuff all on one disc, and all the accompanied stuff on the last disc, which is fine by me. Hopefully the BR/3CD sets don't sell out from their website because I'm not sure I can pre-order quite yet. We'll see how much money I get on my next paycheck on the 3rd and how much will be left over after I pay rent.
-Marc.