looking at the things which can be done with the Parallel deployments in Tomcat 7, I wonder how new or changed configuration could be provided to these various versions of the application.

In a nutshell - what parallel deployment offers is that pushing a new version of a war file to the webapps dir (with filenames like "App##01.war, "App##02.war") and ever user with a new session will get the newer version, all others stay with the old version.

So how could one provide different or additional configuration (properties) to the various versions?

Cheers.