With the upcoming release of patch 4.3 and the final fight with Deathwing, Blizzard is reevaluating encounter difficulty
in all Firelands normal and heroic mode encounters. Over the next few weeks, Blizzard will be toning down the encounters in Ragnaros' home turf to allow more groups to clear and complete the content before the final raid. It appears that the cuts will be coming to both regular and heroic modes, with about the same effect as the 4.2 changes to the first tier of Cataclysm
raiding. The difficulty of Firelands will begin to be hotfixed the week of Sept. 19.
I think that the Icecrown Citadel approach, nerfing raiding content as the tier progresses, is an excellent move by Blizzard to keep raiders playing and trying encounters they may have fallen just short on progression. World firsts have already happened, and that race is long over. Now, groups that weren't working on the content as intensely now have their shot at checking out some of the great encounters in Firelands.