I took a video from Shell, new-notifications branch which is experimental. Those are under design, nothing final!
Just two things.
1. This comes from Jasper St. Pierre (js dev), and Pierre wasn’t online to ask him some more info about his latest work. Gnome is changing things in GSettings, they change things in Notifications libraries, and they change designs as well, adding some more animations.
2. My video is bad. There were some more things I had to screencast, but Shell wasn’t very stable, and it was required some extra time. I will do a new one later.
I tried it, I’m sharing it ;)
You can see all the changes @ Git.Gnome: