I doubt we will either get Jinyu or Hozen and the reason for it is the Hozen are from lore just to Shortlived. A Hozen has with 10 years already his middle ages and with 20 he is already in the last year of his live. For having them as NPC allies it is no problem but if for player characters it makes a big problem. A timeskip from SL to DF for example would mean the Hozen hero would have a quarter of his livetim skipped by doing nothing. Even if we say as allied races that the Hozenplayer where just recruited by the time of BfA the current timeline would mean he has already half of his live behind him. So if DF and all the other Add-ons would take two years it means the Hozen player character would be only able to enjoy 5 more add-ons before he would have to die. 10 at maximum by saying DF and all the following are only taaking one year.
So while the time of how long WoW would still be limited by humans and Orcs as by now the Human/Orcadventurercharacter should be arround 40 it is still not as limiting as the Hozen.