Well, this is interesting... · 8:32am
Today the Brony Documentary group released a trailer for the extended interviews bonus, with extra footage of Tara, De Lancie and Faust. Most of it's pretty much your basic stuff, but...watch what Faust says...
In case you're lazy, she says that she had planned out destinies for the different characters, and mentions Rarity, Rainbow Dash and Twilight specifically. The first two are self-explanatory: Rarity gets a dress shop in Canterlot and Rainbow Dash joins the Wonderbolts. Those are pretty blindingly obvious, and have been built up to over the course of the show. But then she gets to Twilight...who was going to be Celestia's successor. Yes, successor. As in, princess. She also tweeted after the hype machine kicked into gear that this wasn't in her plan, so that seems to imply that this would have happened at some point in time, but not in the middle of the series' run.
This actually adds credence to the idea that MMC was going to be the series finale. After all the staff turnover and with DHX picking up so many projects, Hasbro cuts their losses and orders thirteen episodes to fill out the sixty-five needed for syndication. That way, they can just sell the airing rights after the fact and make a fortune. But when the show remained popular (and possibly because shows like Care Bears didn't take off like they had wanted), they decided to renew it for another full season. The only problem is that this meant MMC was already in production, and it would most likely be too late and too expensive to pull the episode and totally redo the ending.
So what does this actually mean? Not much, really, but it does give some more insight into the show's conception. And perhaps it can show that Hasbro isn't wrecking Faust's vision like so many claim they are.