Daelo posted on the Raids & Dungeons forum about some hotfixes to the Archimonde encounter:
In an effort to apply some of our upcoming 2.2 changes in a more expedited manner, we're hotfixing some elements of the Archimonde encounter. Not every planned change to Archimonde could be hotfixed, the other announced changes will occur...
Nihilum continues their domination of the PvE portion of the game by racking up another world first; this time it's the Archimonde encounter in Caverns of Time: Battle of Mt. Hyjal.