I really hope they don't show anymore UB's, as I think they should really be experienced in game. What they showed is enough to raise questions about what they are and hype us up, and they're likely not catchable so I don't think it's important to know about them beforehand. We know that they strikingly resemble humans, they don't remember Pokemon at all, so they might not be Pokemon at all, or they could be Pokemon from different dimensions or planets. They just look like disturbing abominations, like Type; Null, but at least that thing has a face... and I bet it ties into Ultra Beasts in some way too. We also know that one looks and acts different depending on which game you have, which also raises more questions.
I'm really surprised we haven't seen any game exclusive Pokemon yet, by this point in Black/White and X/Y's prerelease we've seen their exclusives, so why not in these games? Especially in a pair that seems to emphasize a difference in each version. Yes we do have Rockruff's evolution but we don't exactly know if that's tied to the game or to the time of day in-game, same goes with Misdreavous and Drifloon.
I just really want to see more features. More details on Hyper Training, and I want to know if there's a big battle facility in Alola, I'd also like to see some more Poke Ride Pokemon, if any.