The Ext JS 3.0 examples are online already, and I believe Jack made the announcement at the Ext Convention today. Take a look at this sample showing how to create a Microsoft Word-style ribbon UI with Ext JS 3.0. I really like the new button features and the GroupTabs. I'd expect some more examples on how to use some of the new features like the charting and Ext.direct and I'll try and cover those when they appear.
Update: Cutter points out that there's a new Image Organizer which shows off the Direct functionality but I can only see that in the download at the moment. The examples on the download also cover charting too.