It looks like yet another new writer was added this season. Jennifer Skelly is the mind behind the September 3rd "Buckball Season" episode. Her IMDB page seems to focus primarily on animal shows, she does have a few credits for animation in a Nickelodeon cartoon called Zevo-3 and the pre-school targeted 3d animated program "The Zula Patrol".
I wonder what she will bring to the pony table? The announcement looks to be the only MLP related thing on her twitter at the moment.
Thanks to Raffaele for the heads up.