Here's a test wiki with the static/dynamic maps being served by cassini:
http://u.nix.is/wiki/index.php/Maptest
That wiki supports the locale= parameter to the extension so you can
play around with different languages:
(see this bug:
https://bugzilla.wikimedia.org/show_bug.cgi?id=19961 )
Thanks to a recent patch to the export script when you embed a static
map now the static exporter should inject requests into the tile
rendering queue for the area being viewed on the map (actually a
slightly larger one):
http://www.mediawiki.org/wiki/Special:Code/MediaWiki/53815
So once someone embeds a static map clicking it to get the dynamic
version should Just Work(TM).