Junichi Masuda and Shigeru Ohmori revealed several details in the latest Famitsu interview:

• Pokémon Sword and Shield will surpass the 1,000 Pokémon mark.
• Masuda on the Decision to Limit Pokémon Sword and Shield to the Galar Pokedex: He didn’t like the decision, but it was needed. He wanted to bring every single Pokémon to Sword and Shield but they wanted to focus on higher quality animations. Ohmori mentions this idea was proposed for Pokémon Sun and Moon. 
  
•  According to Masuda, there is still no decision taken on bringing non-Galar Pokémon to Pokémon Sword & Shield via updates. All Pokémon will still have an active role in Pokémon Home.
• According to Masuda, Pokémon Home would have some playable features. Will also have connections to future games.
• More details of Pokémon Home: Is the “Home” for all your Pokémon. If a Pokémon is compatible with a  game, it will leave for an adventure. If the Pokémon is not native to a certain region because is too cold for them, then they will stay in “Home” waiting for their next adventure.

Translation by Pokexperto