Listened to it last week -- The gist is that they've found a new home with the CNCF & The Linux Foundation, which bought the IP so that they could continue working on it publicly. Besides the database (which was always open source) this is especially important for parts of RethinkDB that were meant for "enterprise-only", which the company was working on internally before they shutdown. All and all the community support sounds strong, and after listening I decided to take another look at Rethink for my next project :)

There's a transcript on the bottom of the page (on mobile).