Lady Deathwhisper is having her 25-man normal version changed (not the 10-man) to decrease her mana pool and to decrease the health on all the adds. This means that the shield will go down much faster for guilds currently struggling with that aspect of the encounter. Additionally, tanks get a bit of a buff here in that the Adherents will wait a little bit longer before casting, which means there will be more wiggle room in picking them up. We have a feeling the necessity of these changes will be hotly debated.
The ghost waves in Halls of Reflection have also been changed to allow for easier combinations of mobs (no more two mages in one group). The AoE the mage does will also do less damage and be more interruptable, which should make for an easier time staying grouped up.
The complete list of fixes after the break.