Kamigawa is more like a "one-shot", after the end of the kami war it's not a very interesting setting. It's worse than Dragonlance without the heroes of the lance.
Today WotC has to worry more about a right crunch (possible new base classes, subclasses, PCs races and monsters) than a setting, about to sell the right pieces and after the own fandom will create their own homebred settings enough "politically correct".
* I suggest a little retcon of the korobukuru to be more coherent with etimilogy of its name. They wear a traditional hat made with a giant leaf, and then the name means "under a leaf".
* I like the lore of the shen/spirit folk, I imagine them like the elves' cousins but the racial traits aren't so practical.
* Japan produces more Manga comics than toilet paper. Hasbro/WotC not only wants to be really politically correct but even new multimedia franchises to be loved among the Asian markets. Think about all those webtoons you can read totally free in internet. This is a fabulous indirect promotion. Let's imagine how many fanboys who would buy D&D to can play as ersatzs/ripoff of their favorite shonen heroes. Hasbro wants to produce new IPs to can sell manga-anime-videogame and other merchadicing products. And later even a Bollywood version of D&D for the Indian market.
*
Now I am awaiting the moment when somebody says Italians can't produce spaguetti Western movies because they aren't Northamericans.


* If we have to be pollitically correct, can you create stories set in the pirate age where Spanishs is the evil empire who stopped the human sacrifices in the new world and the English the heroes who trafficked blackafrican slaves? and could Otoman empire to be used as antagonist?
* I would bet a new PC has to be created, something about kawai-kemonomimi (" cute-animal ears") because they are popular in some Asian RPGs.
* I dare to say I know how is to wear their shoes, how they feel. We can't forget that scene in Impossible Mission 2 with strange mash-up of Spanish popular festivals.
* I guess WotC will want to develope a videogame like Jade Empire by Bioware.