The official site has been updated with the description for Thinblood under the Clans section:

https://www.bloodlines2.com/en/thinblood

Includes some background, description of disciplines and an introductory video (also available in youtube: https://youtu.be/xELjqNZjmaM )

And here is the stream to this: https://www.twitch.tv/videos/415710551?t=02h38s

No offense, but this is mostly Crusader Kings 2 stream, not a Vampire stream. They talk about Bloodlines 2 only a little bit - and nothing interesting at all.