The main city that we have been seeing alot of shots of it called Hiun City.From the screens we've been seeing, the city should be massive and a huge step for the Pokemon series, where cities are usually small and not too complex.
The battle system is a little different. The sprites now move during certain situations and as does the camera. battles also go faster than before. There are changes to the core system, however those have not yet been revealed.
I love the look of the new legendaries, and Im really excited for all the new features. There hasn't been information yet that I haven't liked to a certain extent. Im really excited for this game. Can't wait.