Nintendo has recently applied for a trademark for the iconic Nintendo 64 which was originally released in 1996. The purposes for the trademark cover a number of things including a video game program, controller for game machine, joystick for video game machine, TV game machine and more. This suggests that Nintendo could be hard at work producing the N64 Mini following the success of the NES Mini and SNES Mini.
Source:
https://mynintendonews.com/2018/05/2...n64-trademark/
N64 Classic announcement incoming? I could see this being an E3 announcement for the holiday season.