Quite a few raiders, including some of our own here at WoW Insider, noticed one more big change to a raid boss that that came in with patch 2.4.3: Anetheron, the second boss of Mount Hyjal, was not dropping Towering Infernals on random players as usual. This made the battle pretty trivial for most raids by making it more or less a run of the mill tank and spank.
Unfortunately -- or fortunately, depending on how challenging you like your raids -- this was not an actual intended change. Vaneras and Bornakk are both reporting that Anetheron has been hotfixed and should start dropping infernals again. Sorry guys, no more free loot. Well, no more freer loot, at least.