You already know Sirfetch'd the evolution of Fafetch'd only available on Pokémon Sword, and well in the next trailer, (as short as the previous one), you will discover Bulltanker the evolution of Tauros, which will be of type Fighting, which will be only available on Pokémon Shield. Here's all I have information about this Pokémon,

Bulltanker
Fighting / Average
The Tauros who win enough fights and become quite powerful can evolve into Bulltanker, which gives them incredible strength
Japanese name: ビッグケンタウロス/ / Biggugukentarosu (meaning big centaur or big idiot of bull)


Here are some other information in bulk,
The trailer that will present Bulltanker will be released one week after Sirfetch'd's trailer,

A bigger trailer will arrive in the first week of October including three new forms of Galar, for Sudowoodo and Bonsly, resembling trees haunted with a pumpkin on the top of the trunk, both Dark / Ground type. The third new form of Galar will be for Caratroc which will become Steel / Bug, it also inherits an evolution but I did not get its name, however, it will be of type Steel / Bug also.

In this trailer, there will also be presented the next arena and it will be fairy type, the champion is called Opal or something like that

It will not be revealed in the trailer but the legendary types will be the Steel / Fighting types for Zacian and Zamazenta, as far as Eternatus is concerned, it will be Dark / Fighting