Twilight: Orchestrated, instrumental music.
Rarity: Classical music
Pinkie: House Music
Rainbow Dash: Rock music
Applejack: Country
Fluttershy: I have no idea.
-Crapton of Music
-Clever episodes
-A few S1 styled, "everyday life" episodes.
-Music
-Equestria Lore (I'm a Lore nerd)
-Music
-Some episode that will finally help me determine who my favorite pony is so I don't keep jumping around
My AP Euro teacher (who is a brony) went to a Spice Girls movie one time. By himself. He said that it was really awkward. I imagine this will be similar.
To be honest, the trailer is freaking me out a bit, but I trust the FiM team.
On a side note, does EQG Twilight remind anyone else of the characters from Interstella 5555, from an art direction?