The Pope has published his apostolic exhortation this week and it is called ‘Evangelii Gaudium’ which means ‘The Joy of the Gospel’. It is principally about evangelisation and follows on closely to Pope Paul VI and his Evangelii Nuntiandi.
There are many more people much better qualified than me to explain its contents, but I suggest first you read it! English translation.
Next you may wish to consider reading the comments of Fr James Martin SJ, author of The Jesuit Guide to (Almost) Everything among others. His article in America The National Catholic Review can be found by clicking A New Vision for the Church.