Simply navigate to the Have You Seen...? forum and look at the threads with the 1.2 prefix - it should give you a good overview of changes and additions in the 1.2 release.
1.2 included a plethora of new features (see @Andrej's suggestion of reading the Have you Seen forum) and has included quite a few bug fixes from earlier versions. If you'd like to try it out, you can always fire up a demo installation from the main page.