This looks like Tutum, which was bought by Docker in Oct '15 [0], has been fully integrated into the Docker ecosystem. I enjoyed using Tutum for a few of my small side projects.
I have no idea what this product does. I've read the marketing website and that Tutum blog post.
My best guess is that I buy a computer from someone (ecs instance, dedicated box, etc) and then Docker deploys code to it for $7 per month?
That's about what I gathered as well. ECS task definitions seem to do just fine.
Started playing around with this. This gives you a pretty gui to launch a docker swarm onto a supported hosting provider. The biggest thing missing here is volume support. It will allow you to share volumes between containers but not let you set up a dedicated volume (ie EBS) to be used by a service. Docker has this feature called volume drivers which can let you do just that but it doesn't seem to be integrated into this service yet.