@Cute Charm; Yeah, the blurbs don't reveal too much, so I have some hope on what they're holding out on us. And I'm certainly hoping Shauna becomes a battler, but I'm still anticipating the Bianca role. I agree that Tierno sound like he'll be a bit less of a rival, but at the same time, since he likes battling to figure out dance moves, he may battle a bit more frequently. Trevor seems to just want to fill the Pokedex, so I don't see him battling too often.
@Silktree; To be honest, at first I thought they were referring to the player by their chosen nickname (which does contradict the one shown in the other screenshot with Shauna but I figured it was just a different game shot). If that is the case, then that would be a nice refresher from the Gen 5 rivals, in my opinion.