Someone leaked (or broke the embargo) of the full contents of the Pope's new encyclical Laudato Si to Italian periodical L'Espresso. Sandro Magister has also made it available.
The whole document, in Italian (pdf file), is available here.
Update: According to Vatican sources, the leaked Espresso text, despite all appearances of a final text, is not the final version... and the final text is still under embargo until Thursday. It is doubtful that the published text will be much different (it is indeed quite likely it will be nearly identical), so the version above is kept at least for the historical record of events.