
As with the Isle of Armor expansion earlier in the year, this DLC pack adds a brand new area to the game, a few new features and some new Pokémon.
New Features
Dynamax Adventures

The main form of these adventures will eventually see you reaching rare Legendary Pokémon that, if you can defeat them, can be caught. Every non-mythical Legendary Pokémon from every previous Pokémon Generation will be available for capture this way - though some will be 'exclusive' to Sword or Shield (depending on who initiates the Dynamax Adventure).
Endless Adventures will allow you to continue exploring and catching Dynamax Pokémon until you're eventually defeated.
Galarian Star Tournament

Once you've completed the story content in Crown Tundra and, presumably the main story of Sword/Shield, you'll be able to participate in the new Galarian Star Tournament at Wyndon Stadium. Here you can partner with one of the many characters from your adventure throughout Galar, the Isle of Armor and the Crown Tundra in a 2vs2 all-star tournament. There'll be some unique dialogue available depending on who you choose as your partner and what kind of teams are formed between your opponents.
New Pokémon
As well as the previously covered Galarian forms of the Legendary Birds, Calyrex and the two new 'Regi' Pokémon Regieleki and Regidrago, the Crown Tundra expansion also includes the long-teased Galarian Slowking.

Galarian Slowking
Category: Hexpert Pokémon
Height: 5'11"
Weight: 175.3 lbs.
Type: Poison/Psychic
Ability: Curious Medicine
A Shellder bite set off a reaction between the chemicals secreted by Galarian Slowpoke’s brain and the spices inside its body, causing Slowpoke to gain the Poison type as it evolved into Galarian Slowking. Galarian Slowking have been observed uttering incantations in order to communicate with each other and appear to chant mysterious spells when using moves in battle.

Curious Medicine is a new Ability introduced in The Crown Tundra and resets all stat changes of its allies when entering the battlefield, including at the beginning of battle, neutralising abilities such as Intimidate.
Galarian Slowking's signature move, Eerie Spell is a Psychic type attack that reduces the PP of its opponent's last-used attack by 3 as well as causing damage.
New Items
Ability Patch

Pokémon Home Update

Also announced today is an update due before the end of 2020 for Pokémon Home that finally allows you to transfer your Pokémon Go collection across for use in Pokémon Sword/Shield and future supported games.
There'll be more details on exactly how this works closer to launch, but it seems that it may require some use of PokéCoins, so there might be additional costs involved as well as the Pokémon Home subscription. Special Pokémon such as Santa Hat Pikachu will also not be transferrable.

By connecting Pokémon Go and Pokémon Home, however, you'll receive a special Melmetal gift in Pokémon Home that can then be transferred into Pokémon Sword and Shield. This Melmetal has the ability to Gigantimax, and it seems that the current restriction on not being able to feed Max Soup to a Melmetal will remain, so this might be the only way to get your hands on a Gigantimax Melmetal for the time being.
Meanwhile, on Pokémon Go, you'll receive a Mystery Box gift that will allow you to catch Meltan in Pokémon Go for a short time, so if you've missed out on previous Meltan events, this is a perfect opportunity to get your hands on Meltan and Melmetal for your Sword/Shield Pokédex at last.
A new Ash's Pikachu distribution

Throughout October you'll be able to get a series of Pikachu wearing Ash's different hats throughout the anime series in Pokémon Sword and Shield through limited-time Mystery Gift codes. These were originally given away for Pokémon Ultra Sun and Ultra Moon but haven't been available for a few years now.
The first two of these are available now. Just input the following codes into the Mystery Gift option in the main menu of Sword/Shield:
More codes will be revealed throughout October and all must be redeemed before the 30th November. Each code can only be used once per save file and unlike Ash's actual Pikachu, these Pikachu cannot Gigantimax or be fed Max Soup to be able to.
When you receive these Pikachu, they'll be Level 25 with random IVs and natures and the ability Static.
And Finally...
One final announcement in today's news was a collaboration with Japanese band Bump of Chicken for a song and accompanying music video celebrating the 25 years of Pokémon games, which we've included below. Enjoy!