Don't get your hopes up. 95% chance they're just going to be streaming the original soundtrack recordings from the disc.
95%, really?
-They specifically said that they improved sound quality.
-They actually re-recorded 66 tracks with orchestra for KH 1.5 remix.
-Pretty much every FF other S-E remake ever done has had a revamped OST: FF1, 2, 3, 4, Tactica Ogre PSP, DQVII, etc.