One thing that hasn't really been touched on is how Fluttershy is unique in that she is a pegasus with Earth pony abilities. They could have an episode where she questions why she was born a pegasus as opposed to an earth pony and maybe how she is more like an earth pony as far as being connected in nature.
Another idea I have (although this one is far heavier so it may not be done) is that with season 9 being the final season, there could be some symbolism in that the Apple family have to deal with Granny Smith's failing health and have to accept she is running out of time before the grim pony comes for her.
That would depend on how much I know. Say it was from the creators of the Powerpuff Girls and i'm sold. Otherwise, I would probably be confused at first, but think nothing of it.
Well I first became a brony in August of 2011. When I first heard about it, I just thought it was some internet troll and was completely dismissive. Then, I saw My Little Brony on the Cheezeburger network, got curious then lo and behold.