Rarity Transforms into What?!

So the upcoming MLP movie will be based on the current Mane 6 and is a continuation of the TV series. Also they can shapeshift into other forms now.

I initially thought the movie would be the start of the next generation of the MLP line, but it looks like it'll use the current generation still. I personally haven't watched MLP since Season 3 and only been focused on Equestria Girls. So I don't know how much the show has changed these couple of years, nor whether or not it's still as good as its used to be.