It's very important to take a good look at DP Groups in CM12. Here are some highlights of DP Groups in CM12:
DP Groups are global-they can be configured from any primary site or CAS, and are replicated throughout the hierarchy.
DP can be a member of many groups.
DP group can be limited to a Role-based Scope, so only certain admins have access to certain DP Groups.
Content can be monitored at a DP group level.
DP Groups can be associated to one or more collections, so that when we distribute software we can choose to Automatically deploy content to associated DP Groups.
When we add a DP to an existing DP group, all content that has already been targeted to the DP group will automatically be distributed to the new member DP in the group. However, when you remove a DP from a DP group, the DP group-targeted content does not automatically remove from the DP.