I'm really excited to make this public. As Anant said in the blog post, we spent some time at the Firebase offices in SF hacking on this together, and I was surprised (in the good way) just how quickly it came together. The real-time updates that Firebase gives you dovetail extraordinarily well with Ember's battle-tested bindings system.
I'm excited about a future where JavaScript developers don't have to worry about building and deploying a backend. While we're obviously not there yet for everyone, I think Firebase really gives us a taste of that future. As more and more web apps shift the majority of their logic, behavior and UI to the client, I think you may find that using a tool like Ember helps you build apps that don't fall apart under their own weight—especially if you're working on a team.