Here's a mechanics change that's been sort of sitting in the 3.0.8 patch notes that deserves a closer look: Dispel resistance mechanics via talents are being changed.
As Ghostcrawler describes it, essentially resistance mechanics will now only protect your harmful damage over time spells and your buffs. Other types of Debuffs and Crowd Control effects, such as Fear, Psychic Scream, and Ebon Plague, will no longer be able to take any bonus from dispel resistance talents such as Silent Resolve, Contagion, and Virulence.
It seems like it's one more way in which, since Wrath of the Lich King came out, Blizzard's been shying away from crowd control mechanics as anything more than a stop gap measure, in both PvP and PvE. Whether this will hold up in the long term remains to be seen, but crowd control artists, be prepared to recast those spells just a bit quicker.