To recap what we already know:
- The PokeGear has been redesigned and will now be displayed on the bottom touch screen with the click of the X or Start buttons.
- Starter Pokemon follow behind the hero outside their PokeBalls ala Pikachu in Pokemon Yellow. To what extent this feature will be utilized has yet to be fully stated.
- Much like FR/LG, 3D locational artwork will briefly be displayed upon entering a new area.
- Confirmed: The Pikachu-colored Pichu will unlock an event involving the Notched-eared Pichu near the Ilex Forest Shrine.
- The female player character ("Soul") is not the same girl from Crystal as many had initially expected, instead being a brand new character entirely.
And I think that's it. If anyone has extra information to add, let me know.