The region divisions are kinda reminiscent of FireRed and LeafGreen's PokeDexes which I personally wasn't fond of.
I liked the habitat feature in BW2, maybe they're taking it a step up from there. It'll be hard to judge until we get clearer screenshots of it. Maybe they're just broadening the whole 'per route' thing (which was a pain in the butt) and making it more regional. Now that would be cool.
I'm also squealing at the fact that we're getting Zigzagoon in the game - Linoone is SO amazing ;A; It looks like it appears kinda early in it too