ESRI have now released their pre-conference Q&A and you can find it here:
http://events.esri.com/uc/QandA/index.cfm?ConferenceID=2F6DC1A1-1422-2418-883C3868A9004888

Here are some interesting blog posts about it:
http://blog.geocortex.com/2010/07/01/esri-pre-conference-qa-now-available/
http://www.spatiallyadjusted.com/2010/07/01/the-esri-uc-qa-response-is-up/

In this Q&A session you will find information such as:
-The WebADF will be deprecated in the next release after ArcGIS Server 10
-The next release of ArcGIS Server after 10 will run entirely as a 64-bit application

The ESRI UC starts on the 12th of July. Twitter: #esriuc