Holy cow! Some awesome person already done way better than a summary (and has done them for the other Happy Fun Hours as well if you are interested). Here's the alternate ranger class feature text:
https://thinkdm.wordpress.com/hfh/revised-ranger-2018/
It does lack Mike explaining his thinking. So I do still recommend listening to the VOD. Which can be found at:
https://www.twitch.tv/videos/338523993
(Another post edit): The other reason to listen to the cast is that the text is in extreme draft form. It's just a rough idea of where he might go. In fact, one of the alternate class features is a direct copy and past from a fighter subclass he worked on awhile back.
It wouldn't be worthwhile to try to figure out the balance of this stuff. He's just getting ideas down.
AD