Noteworthy: the only two games they mention on that page are their two 3DS games.
Probably because it's the only noteworthy games they made. The other ones are a DL-only game on Wii (and I'm sure most people don't remember Line Attack Heroes), and a DSi port of 4 Swords (only available for a limited time).
On the other hand :
- Ocarina of Time 3D is a wonderful remake/port of one of the most famous VG ever
- the StreetPass game is not only their most recent game, but it was also quite successful (along with the other streetpass game, they earned Nintendo some serious dough during the first few weeks, and without any kind of advertisement).
And besides, only those two games are listed on the front page of the main page of their official website.
My guess is they're working on :
- MM3D (almost finished, to be announced later this year... probably in September/late August, not what this job offer is for)
- another game, may or may noit be Zelda related. Maybe a Zelda-related StreetPass game?
Reminder: they seem to have roughly 46 employees, so it's definitely a handheld project (if not just support for another Nintendo game, but I doubt it's that either).