Yongnuo yn-14ex for Nikon?

I'm interested in the yn14-ex for Nikon, but can only find Canon compatible versions. Does a nikon version exist? If not, any ideas if one is being released in the near future?

You need to search for the YN-14EX-N

I found it here: http://www.bhphotovideo.com/..._ring.html - although it appears to be out of stock. A visit to the Yonguo website seems to indicate the model is no longer made, for either camera. Perhaps it has been discontinued.