The latest feature added to Ansible, an open source (DevOps-y) orchestration engine, is called Accelerated Mode. Some of the improvements to that feature, which you can learn more about here, include no more required bootstrapping or ZeroMQ.
Fewer requirements is always nice! Ansible is definitely a project you should keep an eye on I think. Along with SaltStack. Deployment, orchestration and automation are all having a renaissance right now.