You can find detailed release notes for this release and past releases at Release Notes.
We now support Internet Explorer versions 8 - 10 in their native modes. Previously, you had to run them in IE7-compatibility mode, which limited the number of new HTML features you could use in your course content.
We simplified the way you search for domains, users, or courses in the administration pages. There is now a single text-entry field that accepts title, name, ID, etc.
You can now assign a title or subject line to a new thread.
You can now sort by first or last name.
Instructors can create top level posts which can be viewed by all groups.
If you leap-frogged previous releases to upgrade to June 2013, you'll probably want to read the following topics to discover features added in the past.