I love hotfixes. They're like patches you don't have to wait for. Just posted by Daelo, WoW's lead encounter designer (who I've been seeing a lot of lately, but don't remember seeing much before) is a brief account of hotfixes to Archimonde and the Eredar Twins. For Archie:
We just implemented a hotfix for all realms that makes Archimonde's doomfires no longer be able to move right through him after they spawn. Their movement should now be much more consistent with the previous patch's behavior, and melee should have a bit easier time dodging the doomfires as a result of the change.
He goes on to note that any other problems people might have noticed have been un-reproduceable at Blizz HQ, but they're still keeping an eye on them. As for the Eredar Twins, they "hotfixed a bug in the Eredar Twins encounter that prevent a Hunter's Feign Death ability from working if Lady Sacrolash was alive." Nuff said there. These fixes should, as far as I can tell, be live now on the US and the EU realms.