Check out the posts here from the Office Sustained Engineering blog. What I'm post excited about are the following:

For Office Desktop Programs:

· Improved Outlook Calendaring Reliability

· Improved Outlook Performance

· Improved cryptographic functionality by supporting all cryptographic algorithms offered by the operating system

· Tool that enables the uninstall of Office client Service Packs!!!!!!

According to the post, the private beta's staring soon, slobber, drool.......