Well, the Interface Administrator right got rolled out and thousands of admins lost their rights to edit the MediaWiki namespace overnight, without any prior notice on their user talk page nor any known process on how to regain that right.
This has completely wreaked havoc on the English Wikipedia, to say the least. If this was rolled out in a way such that existing admins could've applied to get the Interface Administrator flag before the right to edit interface messages was stripped from the Sysop group, this mess could've been avoided.
https://en.wikipedia.org/wiki/Wikipedia_talk:Interface_administrators
Deryck