His resignation sets off the Ramaphosa era.
Friend of Mandela says he "always knew" that CIA had role in his arrest.
The new autobiography will tell the former South African president's story from his prison release to retirement.
The long days of mourning and sadness have been lightened by endless singing and toyi toyi.
Guests at the South African leader's funeral included Oprah Winfrey and Jesse Jackson, while hundreds watched the service at viewing sites around the country.
About 100,000 mourners had paid homage to the former president, a global symbol of reconciliation, over the course of the three days.
Long lines of mourners from all the country's many communities wait patiently to see Mandela's open casket.
The father of South African democracy is put to rest with rain, songs and toyi, toyi.
Attending the state funeral in South Africa of the father of South African democracy has changed the political weather back home.
A CIA agent fingered Mandela for the apartheid regime's secret police.