Meredith Vieira, who announced in May that she was retiring from her job as Today co-host and signed off in June, isn’t settled into her rocking chair just yet. NBC News said today that Vieira has been named a special correspondent on Rock Center With Brian Williams, the network’s new primetime newsmagazine hosted by NBC Nightly News anchor Williams that will premiere in midseason. As part of her new deal, Vieira also will contribute to Today, NBC Nightly News and other network programming including coverage of the 2012 London Olympics. NBC News president Steve Capus made the announcement today and said Vieira starts her job immediately. The network unveiled the name Rock Center this week; the hourlong show has Rome Hartman executive producing and Harry Smith and Kate Snow already aboard as correspondents.