Gist of the new scarlet violet trailer:

New Pokémon:

Cyclizar (dragon and normal type)

New Mechanics:

Moves:

Shed Tail: Creates a substitute and then swaps the Pokémon out

Tera Blast: Changes types when the user terastallizes

Items:

Mirror Herb: Copies the opponents statement increases when consumed

Loaded Dice: Makes multi strike moves have a higher chance of hitting one more time

Terastallizing:

Opportunity to switch types and change the tide of battle

The game is coming out November 18th, pre-orders have started.

If you want to watch the video: https://m.youtube.com/watch?v=O6zFq5nd0tU&feature=youtu.be