Lot’s of discussions and speculation going on about the new UI of Office 12.
A detailled Q&A about Office 12 can be found on the Microsoft website.
One of the PDC websites has a bunch of screensshots of the new UI for various applications including Outlook. As stated in the Q&A, the authoring part of Outlook your calendar, your mail notes and your contacts will change, not the shell of Outlook.
