Added version of the previous post
The first trailer confirms the existence of the Wi-Fi Plaza in the games. Connecting to other players via Wi-Fi will also appear as similar to Platinum.
The trailer also shows the battle sprite of the Gym Leader, Jasmine.
Similar to the ones in Platinum, it is animated.
The Gym in Violet City is also seen with more elevation.

The second video shows that the Headbuttable Trees from GS will be back.
It seems that any tree is headbuttable. It is unknown if they all give Pokémon.
The second floor of the Johto Radio Tower is also shown.
The battle sprite for the legendary Suicune is also seen.
Lastly, the rare Munchlax will be available for capture in the PokéWalker.