So, I'd ask designers from different countries to create a kingdom based on their own country and folklore/myth, and then bring it all together in one book.
So, I'd ask someone in South Korea to create an original fantasy kingdom based on their history and legends, someone in Japan, China, Africa, India, South America etc. Each one would be unique in design and presentation and a whole land and lore to explore.
Then I'd bring it all together in one book on one world. Tie it all up in one system (most likely D&D) and then work out the relationships between each kingdom. There's so many more opportunities for creativity instead of sticking to the standard western tropes as well as seeing interpretations of fantasy races from other cultures. Players can still have their elves and dwarves, but they'll look and feel very different.
I can see potential in that, and it would be so refreshing.
I was watching some of Ice Fantasy recently, and now elves with a Chinese influence is how I see them, now. Such a great fit aesthetically.