I have been working with the folks at MITN and we have just confirmed the Windows Vista launch for Mackay to be Feb 23rd.
Since we only have an hour to go through an entire new operating system and Office Suite this will be pretty high level but areas i will certainly cover will be:
Vista's Security Enhancements
Vista's new productivity enhancements
Vista's new Graphical User Interface
Offices new GUI
Offices new file formats