I was a little surprised when the rival actually began following you. Maybe it's sort of like that thing in the D/P/Pt games, where people temporarily follow you? I'm glad that we get to name him again, and he has a pretty awesome theme to boot! I don't really think he'll have a similar "Silver" character, as he has a younger sibling so I doubt he'd have a cold personality. Still have high hopes for him though.
New pokemon animations are also cool, although I honestly would've been fine without them. But, would that means attack moves might have different or new animations too? that'd also be cool, but I also wouldn't mind not having them. I'm glad that they showed us quite a bit of stuff, I was worried they would leave us hanging you know?