I really can't wait for that to happen. I'm going to be throwing money at that project like crazy. There's already an emulator for the OS [1]. I had never done any C64 programming, but I was able to do some BASIC tutorials using it with the exception of any video stuff, since that will be different on the X16.
He did some videos about the project [2] [3].
I absolutely hate that he formed the group on Facebook. I'll be missing so much.
[1] https://github.com/commanderx16/x16-emulator