One more in preparation for this weekend's episode... I'm calling it now: Ms. Harshwhinny is the Pony of Shadows and the big bad of Season 4!
Okay, probably not. But how interesting is it that we have a plotline that is crossing season boundaries, as the preparation for the Equestrian Games continues from last season's "Games Ponies Play", and I think it's highly likely that the games themselves are still to come later in 2014. Games organizer Ms. Harshwhinny may not be a major supporting character, but if she continues to represent the Games then I suspect she'll continue to pop up from time to time.
I'm curious to learn more about the games. It sounds like different cities will be competing, and so there may indeed be a Ponyville team assembled at some point. One would think that Applejack and Dash would be shoe-ins to join it (although Dash might have her allegiance torn with Cloudsdale... Or even with the Wonderbolts.) There could be a lot of good story to mine out of the Games once they finally happen.