The updates include enhanced messaging and collaboration, simpler management and support for IT departments, enhanced security, and expanded application support. End users will primarily see the enhancements in messaging that include integration of DataViz's excellent Documents To Go product for viewing and editing Word, Excel, and PowerPoint files, remote search for older messages no longer on your device, free-busy calendar lookup of coworkers, HTML and rich text email support, and IBM Lotus enhancements.
Some of the security enhancements include control over GPS and Bluetooth profiles, which end users may not appreciate too much if things get too restrictive.