Update as of March 16, 2020: an entirely new version of these slides are now available, see http://hojtsy.hu/blog/2020-mar-16/whole-new-version-open-source-state-dr...
I created and shared an open source set of editable slides with plenty speaker notes titled "State of Drupal 9" early in May, based on my webinar with Dries and then the Drupal 9 parts of the DrupalCon Seattle Driesnote. I hope that we can bring this know-how to a lot of conferences, meetups and to companies so people are more aware of what is coming, what happens to Drupal 8 and 7, what's so great about Drupal 9 and what are the key tools involved.
Before I even presented the slideshow first, I already got improvement suggestions from people presenting it elsewhere. So the first time I got to present this session in Minsk, Belarus at the kind invitation of DrupalCamp Belarus organizers, it was already improved from when I first published it. I will keep updating the slides and present where I can in the coming months. Please, do it yourself too! Translate, shorten, lengthen, etc. to match your audience and timing needs, as long as the key messages get through. Be an important contributor to Drupal 9 this way!
Here is the recording from DrupalCamp Belarus: