Here tere is their GitHub where you can check actual Golem development so you can see that they are working on it
https://github.com/golemfactory/golem/milestones

Actually their Twitter looks pretty active with tweets now and then
https://twitter.com/golemproject

And they post update here and here too:
https://blog.golemproject.net/
https://www.facebook.com/golemproject

Project is not dead by any means, and I think that soon they will release another development video.

EDIT: I forgot to mention their Slack channel (very active) where you can register from here
http://golemproject.org:3000/