Track listing is out.
1) "Opening ~ Bombing Mission" [Final Fantasy VII] (Kenichiro Fukui)
2) "Neo ExDeath" [Final Fantasy V - The Final Battle] (Michiro Okamiya)
3) "The Extreme" [Final Fantasy VIII] (Michio Okamiya)
4) "Assault of the Silver Dragons" [Final Fantasy IX] (Arata Hanyuda)
5) Kuraminokumo [Final Fantasy III - This is the Last Battle] (Kenichiro Fukui)
6) "Distant Worlds" [Final Fantasy XI] (Kenichiro Fukui)
7) "Premonition" [Final Fantasy VIII] (Tsuyoshi Sekito)
"Grand Cross" [Final Fantasy IX - "Final Battle"] (Keiji Kawamori)
9) "Darkness and Starlight" [Final Fantasy VI - "Mario and Draco"] (Tsuyoshi Sekito, Kenichiro Fukui, Michio Okamiya)
10) LIFE ~in memory of KEITEN~ (Original Composition by Nobuo Uematsu)
...and the track they sing on is the FF6 Opera.
Don't panic. Nobuo says that it's Japanese Orchestra Concert singers who sing the actual song - the band themselves actually just sing some backing vocals in a section. He also says the FF6 Opera TBM version is over 15 minutes long.
Digest movie with song clips for every track:
http://www.dogearrecords.com/movies/TBMdigest.wmv
