Daelo, Blizzard's lead encounter designer, posted today on the forums that they had decided to ramp up the damage of six bosses in Hyjal and Black Temple: Gurtogg Bloodboil, Teron Gorefiend, Mother Shahraz, The Illidari Council, Illidan Stormrage and Archimonde. This contradicts Tigole's earlier statements that the raid game was where they wanted it to be.
Daelo also said, "Our intent is not to make the encounters impossible. Even with the increased difficulty, I do expect some of them to be quickly beaten again after guilds experience the changes and adapt." But it's hard to see this as anything other than a slowdown of progression for high-end guilds. There's some discussion about this on the Elitist Jerks forums.
What do you think?
Image from Nihilum via the Elitist Jerks boards.