I quickly looked at the changes and they look okay. We can get this patch into trunk sooner than a few weeks.
@tbroyer: Can you update the patch to address John's concerns? Basically, just push methods, as appropriate, from SessionHandler to SessionHandlerClient and SessionHandlerServer that gets rid of any UnsupportedOperationExceptions. http://gwt-code-reviews.appspot.com/114801 -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
