Apparently another wave of ponies is planned for March 9th (though she told me not to quote her on that exact date), along with Transformers on the boys side. They don't know specifically what characters/designs will be available, but she did say they usually try to release new sets, so hopefully something awesome pops up.
I was also told that this is going to be a huge promotion, and they expect to sell out of them pretty quickly. I guess our rabid collecting last time around tipped them off? We didn't have much access to blind bags back then, so these and the five piece molded set were the only show accurate stuff we could get our hands on (Even if McDonalds toys aren't really known for their quality). It sure was funny trying to sneak into McDonalds incognito style only to be called out as the third guy to come looking for ponies for his "Niece" or "Sister". I'm sure it will be twice as funny this time around.