Meowstic is probably going to be their star Pokemon, since the "star Pokemon" of Gym Leaders is usually something from the featured region. But still, nice to see Sigilyph is in the game, I loved that thing ever since my Black 2 playthrough.
And also someone linked
this review of X and Y on a Spanish gaming site that shows some good video footage of the game, I love the new signs that show when you enter a new location. Very French-looking I have to say.
Also, the third video shows Route 7. This route was apparently shown in one of the earlier trailers, since it had that stone building with the flag hanging at the front, the river and that patch of flowers. Also, it appears that might be the route which Snorlax is shown blocking the bridge if you look carefully. But still, you'll see loads of great locations from the videos!
One video also showed the inside of the Tower of Mastery in Shalour City, which has a statue of Mega Lucario.