With the recent Citrix Ready release of Autodesk Revit 2012 and additional Citrix Ready AutoCAD verticals I have asked the product managers about this. This information is based on their response and technical information known to us here at Autodesk:
Autodesk Trueview:
Using Autodesk TrueView on XenApp or XenDesktop is not a violation of the end user license agreement.
Autodesk TrueView has not been tested on XenApp or XenDesktop. It is therefore not supported on XenApp or XenDesktop.
Users have reported successful implementation of Autodesk TrueView on both XenApp or XenDesktop.
Autodesk Design Review:
Using Autodesk Design Review on XenApp or XenDesktop is not a violation of the end user license agreement.
Autodesk Design Review was tested on XenApp 4.5. Autodesk Design Review has not been tested on XenApp 5.0 or 6.0 and is therefore only supported on XenApp 4.5. Autodesk Design Review has not been tested on XenDeskitop.
There should not be any problems using Autodesk Design Review on XenApp 4.5, 50, or 6.0. You may need to use the post install scripts to configure additional users.
http://support.autodesk.com/getdoc.asp?id=TS14669228

Douglas Lauritsen
Support Specialist
Product Support
Autodesk, Inc.