Quote from ironwoman;1238691:
You do realize the game isn't made by Japanese developers, yes?
Also, 9 tailed Kitsune wouldn't be called a Kitsune, but rather a Kumiho, and this thing not even of Japanese origin.
If you're gonna argue about these mythology stuff, at least get your facts straight.
Like others said, it's very unlikely they'll invest tails into the game, considering the opposition it receives in KR server. They won't make tails just for NA server.
If we're being honest, the 9 tailed fox thing probably originated in China, and worked it's way east through Korea and only later found it's way into Japanese mythology (I never said it originated in japan) although fox spirits were already present in Japanese mythology well before the stories of 9 tailed foxes came into being. Besides, nexon have made kitsune canon in Mabinogi via hagi and the ninja update, though as only having single tails. I have no problem if they name a 9 tailed tailset as being kumiho - after all, it being a Korean company, it would only make sense.
Also, if I may make an assessment via assumptions and my understandings of culture (based sadly purely upon past text sources and observed interactions between Korean and Japanese heritage USA citizens) that part of it may stem from many animal spirits being viewed more negatively in korean mythology, combined with the anthropomorphic prevalence (though they tend to be portrayed in the nekomimi style) in both Japanese mythology and modern culture (anime and beyond) Take into account the long-standing conflicts and my knowledge that at least over here, Japanese and Korean heritage families tend to be at ends with each other, and I've heard that the ethnic groups don't tend to get along in general, it may be an unfair bias against an item which might be popular in many of the other servers (i would hazard to guess that the JP server would probably like tails, for example, though I am uncertain about taiwan.)
Given that, it might be an item more for everyone but KR in terms of target customers, and thus be another gachapon money sink item, were it to ever come into being.
I apologize for the rant and any assumptions or observations I have made which are wrong or otherwise stereotypical.
*Addendum note: The 9 tailed kitsune comment was made with the knowledge of 9 tailed foxes presence in other Asian culture's mythology, however pulling from that the character Ran Yakumo from touhou is called a Kitsune given that game is of Japanese make - thus regardless what the item it would be called, it could be used for such players going for that type of cosplay.