I note, by the way, that a lot of anon users do still to be making edits marked as "minor". So has this really been implemented?
Yes, it has. The code is currently in CVS and will go "live" as soon as Wikipedia is updated to the CVS code again. Because it isn't live yet I posted to wikitech-l where the developers hang out. I would have posted a separate announcement to wikipedia-l later, but Cunctator copied my post to wikipedia-l prematurely.
Regards,
Erik