Brilliant Diamond and Shiny Pearl Silence - No News is Good News?
This line of thinking has led me to think about another possibility. It is possible, although unlikely, that perhaps The Pokémon Company (TPCi) is slowly learning that it's probably not the best idea to give away all the new additions to a remake so early or make claims they don't fulfill. Pokémon Omega Ruby and Alpha Sapphire (ORAS) suffered from all of the new content being known well before the games dropped. Granted, some of that was from leaks, but a good deal was from TPCi themselves. The fact that the BDSP boxes just feature Palkia and Dialga could mean that they don't get new forms, but it could also be a red herring. Perhaps they do, but they aren't on the box art. It's even possible the box art is dummy art, but I doubt it given how high quality it is. As for games making claims they don't hold up to, the remakes often have that issue. I would consider Pokémon Ultra Sun and Ultra Moon (USUM) to basically be remakes even though they dropped in the same generation as Pokémon Sun and Moon. Although TPCi said they would be new adventures, they barely felt any different. A handful of new pokémon and a slightly different story doesn't make for a new game. At least Pokémon Emerald and Pokémon Platinum added Battle Frontier content. They didn't differ enough from their base games either, in my opinion, but they felt like they did more than USUM. Maybe I have my nostalgia glasses on.
Either way, I'm hoping for some new content in BDSP and I have yet to lose hope. Despite the fact some content creators like to parrot each other saying that "Pokémon has forgotten about Megas," spin off games and Pokémon Go have shown that isn't quite the case. They certainly aren't a focus anymore, but they haven't been wiped from existence. I'm still hoping they just become a remake and spin-off staple so we can still keep them around.