The official Ryu Ga Gotoku Twitter account has confirmed that the Yakuza Remastered Collection & Yakuza 6 are going to be available on Xbox in Japan.
They are getting the North American versions instead of the original Japanese version that was available on PS4 in Japan. Since the localized version retained the Japanese sub/dub.
With Yakuza: Like a Dragon doing a similar thing for the PS5 version giving Yakuza an International version is quickly becoming the norm in its home country!
Yakuza Remastered Collection will be released 28th of January 2021 and Yakuza 6 will be added to the service 25th of March 2021.