The following/riding Pokemon look good, but they still haven't really shown any major hook for core players.
E: Yes, y'all, I know this game is primarily aimed at lapsed/casual/Go players. They've said that they want long-time players to enjoy it too, though, and the advertising reflects that (from the US website: "...gameplay that is easily approachable for newcomers to the series, but is also deep enough to keep veteran Trainers on their toes"). I'm just waiting for them to show something that changes things up a bit beyond a simplified version of "the same game you played 20 years ago, but prettier."