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.
You can download concrete5 5.6.0 from here:
Note: for those of you running sites with overrides or a significant number of packages, you may want to wait for 188.8.131.52. 5.6.0 has many modifications under the hood. As always, perform a full database and code backup before upgrading concrete5.