What pack do you think may be releasing next?

I know there are so many hints about horses, but ... I am not seeing any real preparation for them. They seem like an even bigger update than a lifestage. I feel like there should be something more substantial happening than picture hints before we get them. Unless horses are a big secret, and so much effort has gone into keeping the secret. I just am not feeling that they are close.

Before the survey, I would have guessed at a medieval or futuristic SP or EP, but now that it is almost certain that these themes are just kits, I have no idea what to expect.