I've just renamed a page and received the following as a result:
Successfully renamed users/jondowland.mdwn to users/jon.mdwn.
The following pages have been automatically modified to update their links to users/jon.mdwn:
... In this situation I think the link to pages should be expanded to show the entire path, since there is quite likely to be a lot of things like "discussion". -- [[users/Jon]] [[done]]