Hi, In have a hand in the Marketing team behind the Pokemon franchise, and I have a bit of spoilers for the Pokemon day reveal.

-Yes, there will be a reveal of the new games
-The Official Pokemon YouTube will drop a video showcasing Pokemon throughout the years.
-They will show all of the main games all the way up until Sun and Moon, then the logos for the new games will appear.
-There two versions as usual and *HINT*: they are named after weapons.
-Each starter will be showcased as if they were just discovered for a split second but not named.
-There will also be silhouettes of the legendaries in the trailer as the camera pans up.
>Zeraora will also be officially announced with a special distribution.