Have you been getting the other Pokemon newsletters they put out? They usually send some sort of a ad out once a month, towards the middle or end of the month. (I think the latest one was "Fly High with Sword & Shield - Evolving Skies" back in August.) You might have to change your e-mail settings to allow them to come in. Not just your spam filter, sometimes your e-mail will just block the newsletter from coming in altogether. You might need to go into options and manually put in a exception for the Pokemon Newsletter's address.
I'll admit, BDSP looks kind of...skippable to me, too. I'm sure they'll have some sort of Delta Episode thing for the postgame, but still. I thought that maybe it would feature Manaphy, since the Ranger games aren't a thing anymore. BUT...you're just going to be given a Manaphy egg over the internet.
/Receive a Manaphy Egg as a gift for early purchase of Pokémon Brilliant Diamond or Pokémon Shining Pearl.
diamondpearl.pokemon.com
Now, Legends Arceus keeps looking better and better. And that's the one I want to make sure I pick up. I mean...it's got new pokemon, so I really have no choice, but still. It's going to be fun to be able to Soar again, too. Still don't know who my starter's going to be, though. They picked the most popular starters, and they know it. And since there's only one version of this game, a part of me is wondering if some wild pokemon will be locked behind what starter you pick. They haven't said anything like that, but it seems like something they would do. It's still Gamefreak, so they might still manage to mess it up, but this seems like their most high-effort Pokemon game in a while. I'm really hoping this one's good.