Aloma Wright will come back for the final season to play a new character (As seen in Wiki):
After being renewed for a seventh season, Scrubs creator Bill Lawrence, promised Aloma Wright another job on the show because killing off Laverne was written under the impression that it was the final year of the show. Roberts will play a new character that is similar to Laverne, but only J.D. can see the similarities. Initial reports that she would play Shirley, Laverne's twin sister, who is supposed to be the anti-Laverne, where she is an alcoholic and non-religious, turned out to be untrue.