Pope Benedict has now completed, in German, the third volume of Jesus of Nazareth (Die Kindheitsgeschichten) on the childhood of Christ, and it shall soon be published in various languages. He is also working on his fourth encyclical, on faith, for the upcoming year of faith.
Cf. Palazzo Apostolico.
P.S. In his 11 Oct 2011 Motu Proprio Porta Fidei, his Holiness announced the upcoming year of faith which will begin 11 October 2012 (the fiftieth anniversary of the opening of the Second Vatican Council, the twentieth anniversary of the promulgation of The Catechism of the Catholic Church, the commemoration of Blessed Pope John XXIII, and the traditional feast of the Theotokos [The Motherhood of the Blessed Virgin Mary]).
The year of faith will end on the Feast of Christ the King 24 November 2013.