Looks like Final Fantasy: All the Bravest is what it is, but that doesn't really get us anywhere. Sounds like a bundle to me, though, like Final Fantasy Anthology was for these games on the PS.

Bottom left sprite looks kind of like Bartz as a mystic knight, but none of them perfectly match any of the old FFV sprites. Even the obvious black mage in the upper left (which would have to be Galuf or Krile if it's any of them because they're the only ones without the C-shaped emblem on their hat) doesn't perfectly match any of KrileorGaluf-as-BlackMage's sprites. yeah I know, but speculating is fun.

But they could have altered the sprites.

It would be really awesome if it's something new, and they just happened to reuse the Behemoth from FFVI! But it's not.