What are we actually supposed to do?
One thing you can do is to subscribe to the mediawiki-i18n list. Every week I will send information what i18n related stuff is going to be deployed to WMF. You can help testing before and after deployment and spreading the info if there is changes affecting your language communities.
Thank you Nike, I've applied for a subscription.
I've expanded and clarified Language support team/FAQ. The process is currently unclear in some points which I've highligthed, could someone clarify? (See also my mailing list message with a request to Gerard.)
Sadly I cannot post to CLDR, due to an error that stops me creating posts. It recommends that I report this error message, except that the error stops me creating posts to report the error that stops me creating posts... could someone else perhaps file the Manx bug for me? How embarrassing.