The latest release of Concrete5 is now public. From Concrete5:
"concrete5 5.6.0 introduces a completely rearchitected advanced permissions system that is better in every way. 5.6.0 also adds a new workflow system (which uses these permissions), an updated UI, and over a hundred other bug fixes and feature improvements. Read on for a video of the new permissions and workflow systems."
Our recommendation is if your Concrete5 website is version 4.2.2 or older that there would be some real advantages to upgrading your website now.