Reggie hints at top secret highly anticipated game?

Reggie appeared in a video at the start of the Nintendo World Championships to share why he can't be there in person. 



The Mario sound would make anyone think a new 2D Mario game. On the other hand the woking behind closed doors part makes it seem like a 3rd party game or a deal to get a western 3rd party character into Smash Switch.

I don't think the sounds have anything to do with it, but I honestly have no idea what it could be. I'm assuming it's most likely not a specific game, but just noting that they DO have top secret projects in development.

In my greatest fever dream, I'd want the 'secret project' to be Nintendo's own version of Kingdom Hearts where they introduce a new character to have a heart blade that opens door ways to other worlds within the Nintendo universe helping out certain characters. If it happens, I think I'd die of pure happiness. xp

The fact that's it's a highly anticipated title gets me excited. I won't be upset if it's not Smash Bros. or some other IP I like, as long as it's something that's a heavy hitter like they're implying.