First, OpenStack is a poor abstraction for what most people want. I don't even think it's worth bothering with if you can help it. Docker is what people should (and will) be building tools around instead of OpenStack. Docker integration in OpenStack is neat and even fun, but to me a distraction.
Autoscaling is interesting because it's only one part of a more complex problem of distributed orchestration. There might not be a good general purpose solution to this for a while. Every organization has different policies and requirements for scheduling resources. Docker was designed to be driven by any sort of automation at that level, but specifically avoids solving that problem.
But there's plenty out there to help you put together this solution for yourself. I'm curious what exactly you're waiting for in a solution.
