I'm guessing Nintendo is prioritizing the big publishers first (western and Japanese), especially the ones who actually supported Wii U some.
I'm guessing Square is one of the first considering they already announced Dragon Quest and FF14 for NX.
Why would Square get one of the first ones then, though? If true, wouldn't that imply that they're simply going after whatever publishers they can get interested? And why would Square be interested now when they've largely ignored Nintendo home consoles since the mid-90's?