When a user updates from python2.2.x to python2.3.x they are instructed to run /usr/sbin/python-updater. I have created a patch for python2.3.4.ebuild that will automatically run this when changing minor versions. Also as a side effect of recompiling python over and over again I noticed that no matter what version you upgraded from a message about python2.2 was displayed. I now have that displayed only if the previous version was python2.2.
Created attachment 43472 [details, diff] Patch for calling python-updater in pkg_postinst
Python-updater calls emerge which is not allowed from ebuilds. Unfortunately einfo is the best we can do currently.