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 )

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.