Rainway is an app that lets you stream games directly from your PC to other devices- in other words, a universal ‘remote play’ app for PC games.
Apparently, that’s not the only thing that is going well, either, as, according to a post on their official Discord server (via Reddit), talks with Nintendo are also proceeding well.
While no official confirmation or rejection for the app has occurred yet, the developers note that things seem to be coming along okay.
Whether or not the app ends up releasing officially on the Switch remains to be seen- I would be very shocked if it does, to be honest.