I for one would actually be happy with a return of habitats like they did for FR/LG, or at least a facsimile like the stuff we're shown here. Also, yes, I think some Pokemon would be in more than one Dex.I started it. A sectionalized Pokedex reminds me of habitats. It seems to me like they're looking to make the player more cognizant of the way animals (and some plant life) in ecosystems work.