Looks like she'll be meeting with Mandela's current wife. They've been married since 1998.
"Mrs. Obama will spend most of her time in South Africa. She is scheduled to meet with Mandela's wife, Graca Machel, tour the Nelson Mandela Foundation, where his papers are stored, and visit the Apartheid Museum, which tells the story of the rise and fall of the now-abolished system of white-minority rule."
Michelle Obama To Honor Legacy Of Nelson Mandela During Visit Thursday, June 16, 2011 By Darlene Superville ; Associated Press ;
http://www.newstime.co.za/SouthAfrica/Michelle_Obama_To_Honor_Legacy_Of_Nelson_Mandela_During_Visit_/27228/
Just in case anyone was willing to "move on" from hating white people in another country over whom we Americans had no control. Except that many in the U.S. participated in economic boycotts to encourage an end to S. A. apartheid. But that doesn't count. The white church-led abolition movement doesn't count. The deaths of hundreds of thousands of Union troops don't count. Freedom rides? They don't count....