Six songs in a 22 minute episode.
Seems real legit, folks. We should just go ahead and call this "Season Finale: The Musical"!

If this isn't bullshit, and there really are six songs, then I'm sure that most of them will be thirty-second little ditties like Pinkie sung to the Cake Twins in S2.

There's already 2 songs that were released on the internet guys.
Not only that, Sethistro confirmed that Daniel Ingram plays a much bigger part in this episode and there's even a song involving a (until now) songless princess.