Well, I did say some was speculation. And Blizzard openly said that the Kaldorei were based on the Japanese.
I do not remember Blizzard ever stating that the Night Elves are based on Japanese culture. In fact, I'd venture to say the samurai look of the Pandaren is based more on Japanese culture while the Night Elves are clearly, and I mean clearly, based on Korean culture.
Kimchi - Korean Dish.
Hanbok/Dangui - Traditional Korean clothing.
I could go further into this if you'd like and you might want to update your guide to reflect this revelation.
Edit: Just going to toss in that the Metzen said the building structure was a combination of Japanese and Nordic architect.
Pandaren are based off of chinese now, because Pandas are the national symbol of China and somebody complained that the Chinese symbol using Japanese icons was disrespectful.