See Change Log for details of the new features and bugfixes included in this release, and methods that are now deprecated.
Note changes to the PDF Writer: tcPDF is no longer bundled with PHPExcel, but should be installed separately if you wish to use that 3rd-Party library with PHPExcel. Alternatively, you can choose to use mPDF or DomPDF as PDF Rendering libraries instead: PHPExcel now provides a configurable wrapper allowing you a choice of PDF renderer. See the documentation, or the PDF scripts in /Tests for examples of use.
Please note that a patch has been added to these downloads: 13th October 2012