Yes this is based on the trial release of ECS. Some extra features were added in the GA release last month. There is now ECS support in the AWS web console Also ECS Services can automatically register containers with an Elastic Load Balancer.

We launched http://force12.io on Friday which is a demo of container autoscaling running on ECS. I'll be doing a blog post this week on how we're using ECS.

Also odd that, if you read until the end, the author professes to have not actually tried using ECS yet.

It's a good collection of the author's impressions of what ECS looks to be from the documentation, but it's a little out of date.