Sitecore 8 Roles Dependencies

Here is Sitecore 8 roles graph with installed ExM and WFFM:

Some remarks:

1) New roles: List Manager Editors, Experience Explorer, Analytics Advanced Testing, Sitecore Client Bucket Mangement, Analytics Maintaining

Sitecore Roles Graph

 

Here is visualization of Sitecore Roles Graph for Sitecore 7.2: