[CrackerG]

Things I can remember off the top of my head:

Spoiler:

-New theme at the end of the Snow chapter
-New arrangement of Vanille's theme
-Really dark, subtle orchestral track that plays shortly after Vanille's theme
-New arrangement of Caius's theme
-Dark, interlude-y piece in Noel's chapter - not horribly interesting
-Extended version of "Sazh & Dajh" - also not horribly interesting but still nice

And then of course there are some minstrel & street band songs that would be great as a medley or something:
-Japanese version of "The Savior's Words"
-Acoustic vocal/guitar version of "Eternal Wind" from FFIII - remix confirmed for OST+ by Mizuta
-Acoustic vocal/guitar version of "New Bodhum"
-Acoustic strumming I can't figure out the identity of, if there is any
-Street band version of "FINAL FANTASY" (aka "Prologue," "Opening Theme," "Credits," what have you)
-Street band version of "Terra's Theme" (FFVI)
-Street band version of "Battle at the Big Bridge" (FFV)
-Piano bar version of "Serah's Theme ~ Memories" (FFXIII-2)
-Trumpet version of "FINAL FANTASY XIII - The Promise"

And these are totally pushing it, but they're in game anyways:
-Acapella "Victory Fanfare" chant
-'Aggressive' Mixes that play before some enemy encounters
-Drum/percussion bare-bones version of "Chocobo Carnivale"

That seems like substantially more than in previous games, but maybe I just wasn't paying as much attention. I'd be happy with just the three main cutscene omissions if that's all we'd be getting.