I am sincerely surprised they haven't released this in North America. I'll be kind since I'm on the Yakuza thread, but the modern day games aren't enjoyable to say the least, this samurai based one looks fairly good and I bet it would sell well here. If the other Yakuza games can turn a profit, this one should have no issue doing so.
Every PS4 can read every PS4 GAME disc version. The PS4 has no regional lock for physical GAME discs.
It will even download patches, no problem. The only blockade is online download content.
The online store has a regional lock. So for example
you can buy the japanese Yakuza 7 PS4 disc version and play it on any account,
US, german, greece, doesnt matter (but it will still be in japanese if japanese is the only supported language of the disc).
But the online store for that disc version
will only work if you are logged into a PS4 account that matches the region of the disc (in this case Japan).
Otherwise the online store will give you a error message.
We talked a lot about Kenzan and Ishin here in this thread so maybe you want to check the pages.
It would be too much content to put all of this in one answer here.