Teamsite 6.7.1 Roles

System

Has anyone found any documentation to help explain how roles are setup in the 6.7.1 (Windows) environment. We are trying to migrate utilizing the iwusermigrate and iwaccessmigrate and it doesn't appear to look the same as it did in 6.5

Outside of the 6.7.1 manual is there anything that documents how the roles work? Or compare them to Teamsite 6.5?