Today, alongside filings for symbols for an NES controller, SNES controller, and a Switch with JoyCons attached, there was also an N64 controller.
This filing is similar to one for the SNES controller last year.
Alongside this, the filings were filed under goods and services, which obviously means something playable will be made with this.
Here's the picture:
Now it's not a matter of if, but when the N64 Classic comes out. What games do you expect or want for it?
Also, here's the NeoGAF thread on it:
http://www.neogaf.com/forum/showthread.php?t=1408657