Kanto Trailer coming later next week with a reveal this week for the shield exclusive pokemon

Kanto trailer showers a lot of the kanto returning pokemon and galar forms and evolutions for them including pre-evolution for lapras

new galar forms are psyduck (sword exclusive and is psychic ice type, had a bigger head but eyes closed because it has full control of its mind now) and meowth(shield and is steel type and has a big fur coat). No new eeveeultion.
Giga forms for Eevee, Pikachu

This is all in the trailer

Most of the cut pokemon are "copy" pokemon that have a lot of the same dual typings which are replaced (Dialga is not returning but there is a dragon steel type already revealed)

Expect fewer starters than originally thought making the cut, almost no legendaries past gen 4 make it, and there is only three extra legendary pokemon in Galar that aren't the two revealed and eternatus

that's all I got folks