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>Pokémon HOME is listed by some as coming "Mid-February", others as just February.
As seen before, the game has boxes, specifically 200 boxes of storage in the Premium Subscription and transfer between the main games can be done by dragging and dropping. You also have the ability to search your boxes based on various criterea and order. Eggs cannot be placed in Pokémon HOME and Pokémon from Let's Go Pikachu/Let's Go Eevee only gain their data such as abilities when transferred into Sword & Shield.
The GTS will allow you to see from where the Pokémon originates. If it has been put in from Bank, Let's Go or Sword/Shield.
The mobile version lets you see the 3D Models, rotate them and so forth
The National Pokédex is separated by region so you can look at all Pokémon at once, or get a list of all Kanto Pokémon, Johto Pokémon etc.
According to 4Gamer, If you have multiple user accounts on the same Nintendo Switch, you have the ability to access the different save files in one copy of HOME as long as they are on the same Switch, but we are currently hunting for further clarification on this.