Wowinsider: Blizzard posted a list of hotfixes to Ulduar last night in their ongoing hotfix thread, almost all nerfs, and a notice that they were "making further difficult adjustments via hotfix" to Ignis, Razorscale, XT-002 Deconstructor, The Assembly of Iron, Kologarn, and Auriya, with changes to other encounters "highly likely" to occur once they're done with these. In this case I read "making adjustments via hotfix" as "giving them a good whack with the nerf stick."