Here's some more stuff that was revealed at the New York Comic Con:
New Villian goes by the name of King Somber
Discord Is pretty much 100% Confirmed
History of Celestia and Luna Coming up
Interest in visiting the Griffon Kindom
Official Soundtrack probably on the way
More Manehattan
All season 3 songs from the first Comic Con are from episode one
Hoofed mammals can talk, while others cannot