Until the language is actually released, at least in an alpha version, writing a tutorial is just speculation. Anything can change in the actual language implementation.
That being said, the author initiative is laudable if you don't want to watch a few hours of Youtube videos.
Watching Jon Blow's videos I could tell this was something my friend would be interested in, because the problem space is very similar: you need realtime performance, can't afford even the slightest garbage collection pause, etc. However, I could not tell my friend "go watch videos for six hours".
Thanks to Jorge Rodríguez, I can email my friend a document that will take him less than half an hour to read.
"If you want to never get any work done, use a programming language like this: https://isocpp.org/blog/2012/11/universal-references-in-c11-... "
I used to enjoy programming in C++, even though I always thought it was too complex. Too many things to learn and too many approaches. For example, I never could grasp template-meta-programming thing. May be I didn't dedicated enough time, but that's the point. If it takes so much time to learn the language and its complexities, you have much less time to program "things" with it.