To add to Colin's list, we also have:
* the ability to set license pools for groups of controllers so that they cannot exceed a certain value
* Multizone
* AirMatch (new ARM tool)
* UCC enhancements and support for new voice and video protocols
* Better WebCC
* Better AppRF
* More granular, and simple, control over large WLAN network deployments
The release notes are a good place to start. From there, engage with your local Aruba sales team for more.