I'm so glad other people are on board with the Audino evolution thing. I want it and I think it's likely. I hope it will be speedy and bulky, and that it can learn both Reflect and Light Screen, which I love to have in my party. Design-wise, I imagine it with butterfly wing-type things on its legs and arms. It would be pure Fairy type (along with Audino) if the type turns out to be real. (I really hope it will.) ...Obviously the design part won't come through for me unless I'm somehow psychic without knowing so (although I did think privately about a a Fairy type, not just passingly or jokingly, but with serious thought and consideration, before the rumors even started...), and the stat distribution I also have no control over, but anything with better stats than Audino (although, having used Audino in Pokemon Black, I say it wasn't that bad) while still retaining its charm and role as a team supporter would win my adoration.
As for everything else, I don't think that anything is impossible with Gamefreak. I don't really believe there are "rules" Gamefreak can't break, when it comes to evolutions. Some things are more plausible than others, but nothing is unthinkable.
I just don't want already decent Pokemon to get all the evolutions, though. What about the Pokemon with the low BSTs?
Generation IV was lovely with its new evolutions, in my humble opinion. So I'd love to see more!
This post is brief because I had a longer one that got lost, and I am too frustrated to type it again. :x