Double post, sorry.
I've got some informations... nothing new, just old stuff that might be related to this game in some way.
1- The lore of Shiver Star
I was looking at
the Shiver Star page on Kirby Wiki, and I've read an interesting sentence: the former inhabitants of Shiver Star had to move away from the planet for some mysterious reasons and they left on it some abandoned buildings and factories which are still in function.
This piece of lore apparently comes from the official website of Kirby 64, which despite being very old, is still online, but it's all written in Japanese:
https://www.nintendo.co.jp/n01/n64/software/nus_p_nk4j/buru_s/index.html
Since this part of the lore seems to be official, it's possible that it's still canon and Forgotten Land will reference it. The Forgotten Land might not be Shiver Star, but a human colony made on some other planet after the humans left Shiver Star. Shiver Star is filled with robots and there is a chance that the Haltmann company reached the planet, since the HR robots are probably built by them; that might be the cause of the first migration of the human species, but what happend in the Forgotten Land to make them leave the planet again? Robots are yet to be seen, so that's probably not the cause... are the "Beasts Corps" the reason, or did they came only after nature took over and humans already migrated again?
This theory leaves it open for humans to still exist in the Kirby universe, just not on Earth anymore. Maybe they're spread all around the universe in several colonies.
2- Super Mario Odyssey
This game's setting seems to be a bit inspired by Super Mario Odyssey, especially New Donk City. After thinking more about it, I noticed that it might not be just inspiration, but a direct homage to it. The boss of the shopping mall level is a gorilla who shares some similarities with Donkey Kong, and New Donk City is supposed to be the city where the arcade Donkey Kong game is set.
An old interview of Shigeru Miyamoto came to my mind.
This also applies to Kirby in a realistic setting, he's going through the same process, and they probably made it in the new game only because they have seen that it worked in Mario Odyssey.
Excluding the fact that normal people don't appear in the new Kirby game (?), the parallel is perfect, especially if you replace Pauline with Adeleine in that sentence.
This is what brings me some hope... If this game is really that much influenced by Mario Odyssey like it seems to be so far, this philosophy might have been applied to Kirby as well. We know how in the past they avoided referencing humanoid characters in Kirby because they thought they were unfitting. The same happend with Kirby's Dream Land 2, when in the concept phase, Rick, Kine and Coo were originally planned to be a mech/tank instead of animals, and later the idea got changed because a mech was unfitting for Kirby. The Kirby series evolved and we eventually got Planet Robobot.
So, are they finally going to accept Adeleine as a regular character in the series from now on? Are finally human characters in Kirby not a tabu anymore, since the existence of humans is heavily hinted in this new game?
Only time will tell.
I can't wait for more Forgotten Land news.