Resolve New Registrations is where all matched records appear (with a match score over a certain set level).  Resolve New Registration shows the same data that Automatic Duplicate Management uses. So any matched pairs in Resolve New Registration with a match score over a certain level will be merged by Automatic Duplicate Management when the task runs that night. Conversely, any existing records not already in Resolve New Registrations will not be merged by Automatic Duplicate Management. Any future records that find themselves in Resolve New Registrations will be merged by Automatic Duplicate Management (if they meet the minimum match score).