Actually, that's something I hope the movie will explore, Twilight DOES still have access to the book of the Royal Sisters, she can probably read up on the history, which transitions into a flashback. Not something necessary for a whole series, but if the movie doesn't cover it, maybe so.
Luna's changes sound more interesting to show, Sombra on the other hand... Eh, there's not enough to him to make an entire series based off his character.
Oh yeah, that would be pretty neat.
Sounds awesome.
Eh, are those ponies really developed enough for a series?
Yus...
And yus...
N