Third party studio Tantalus has done a lot of porting work for Nintendo this generation, bringing Mass Effect 3, Deus Ex Human Revolution, and Twilight Princess HD to Wii U.
Looking ahead to NX, many theorize that, much like Sony and Microsoft, Nintendo will "remaster" a lot of its Wii U titles for NX, in order to cheaply bolster their library and reach a larger audience than they were able to on Wii U.
Given that Tantalus are by now quite familiar with both Wii U and dealing with Nintendo, they could be a prime candidate for such "remasters", thus taking some of the load off Nintendo's internal teams.
Could Tantalus, as gaming journalist Emily Rogers recently suggested, become to Nintendo what Bluepoint, (Uncharted Collection and Gravity Rush Remastered on PS4, God of War Collection, Shadow of the Colossus HD, and Ico HD on PS3) is for Sony? After all, getting to work on a Zelda title is certainly not something that any old developer gets to do, and suggests that Nintendo and Tantalus already have a close-knit relationship.