Ignacio Ingrao, Vatican affairs journalist for Italian weekly Panorama, reports:
Six months after Spe Salvi, the Pope publishes his third encyclical. The document should bear the date of May 1st, feast of Saint Joseph the Worker. It will be a social encyclical ... .
The document is divided in two parts. In the first one, the Pope recalls the encyclicals Populorum progressio, of Paul VI, and Centesimus annus, of John Paul II; in the second part, [he] assesses the great challenges of our time.
Tip and source: Papa Ratzinger Blog