Just a friendly plug that if reading this post got you excited about the future and you want to be part of shaping what's to come, check out the FSE Outreach Program: https://make.wordpress.org/test/handbook/full-site-editing-outreach-experiment/

All are welcome and so much feedback is needed!

P.S. I am most excited about all things templates: extending what templates can be created, allowing them to be preserved when switching themes, incorporating patterns better into creating a new template, etc.