Apparently, the news started with a tweet from BlackKite that showed a capture of the advert, a link to it and the following synopsis:
Nintendo is hiring a level designer for The Legend of Zelda series. Will create events/dungeons/fields/enemies from design to actual implementation. Should have game planner experience on console games & can communicate in Japanese.
Then IGN and other media outlets quickly confirmed everything. With a web translator we too can get the gist of the recruitment notice. I've attached the capture of webpage and a capture of Google translated version of it in the thread with this news so feel free to click the title to head to our forums and have a look at it.
It is an important find, as even though no game has been announced the mere fact of Nintendo scouting for talent to work in the Zelda franchises while at the same time offering a temporary contract that will only be renewed until the project is completed, which signal us to an specific new game. As an interesting side note, a comment by BlackKite to address someone's conjecture to this be for a Zelda smartphone game explains that term used in the form makes it more likely that they refer to proper console gaming.
I can recall that some months ago Grezzo posted what was heavily implied to be a Zelda recruitment notice. Whether this is related or they are working in two different projects is left to be seen.