From someone not very invested in the OpenStack process it feels like all the momentum of the recent push of the project just withered away all at once. I am not sure if the container crowd ate it's lunch, where containerized appliances just solve the problem of openstack better.
OpenStack is a platform for creating an Infrastructure as a Service (IaaS). So it's running on some physical machines, and manages your physical machines to slice into VMs. There you get to manage / create networks, storage, etc. Basically running a private cloud in your own datacenter/basement/office. Openstack has grown more than just compute. It has a supposedly compatible interface for S3 an object storage system…
From that perspective, container solutions are delivering a better developer proposition than OpenStack has yet managed. There are ways now to build container clusters that you can ship in parallel to AWS and Azure with very little code difference.
In that earlier discussion I was skeptical of OpenStack precisely because of its focus on infrastructure first. Without the buy in of being a clone for a specific cloud structure (AWS compatibility over anything else, for instance) or the backing of traditional datacenter/server vendors (IBM who eventually started into BlueMix; Microsoft whose "on premises Azure" is now firing on most cylinders but was announced as a plan early in OpenStack's history), OpenStack didn't seem to have an obvious niche in the infrastructure world. The closest to a niche it might have had in its early life was the promise of application portability between clouds and that never quite seemed to be delivered.
I can tell it frustrates infrastructure folks to hear that containers have been eating OpenStack's lunch, but that is the very real case from the developer perspective. As a developer today, I go for containers and OpenStack is no longer relevant on my radar. Sure I can run containers on OpenStack, but containers abstract away more of the infrastructure and I have less and less care what cloud(s) is underneath the container cluster. When I asked OpenStack people what OpenStack might deliver to me that vision of application portability was tantalizing but never seemed quite finished; container technologies have actually delivered that.