Things that excite me from the new Sun/Moon trailer:

• New region being a chain of islands, so Surf will actually be used more than once
• Rotomdex
• Real time updating Town Map on the touch screen that marks places of interest
• Expanded character customization
• Solgaleo and Lunala
• That day/night cycle difference!
• That night cycle skybox.

Things that are possibly alluded to in the new Sun/Moon trailer:

• Possibly two rivals, Hau and Lillie (Hau was shown to choose the starter weak against yours)
• National Dex integration during main game through QR codes
• Second starter set?  Your initial starter is not given to you by Professor Kukui, or his assistant, and there are still 4 generations of starters without Megas
• MORE MEGAS
• Non-static Pokemon locations
• Day/Night variation in Pokemon locations and rarity

So much potential from Sun and Moon so far.  Can’t wait to see more.