There were several changes that affect us for raid encounters in today's patch.  Here are a few:

The Bastion of Twilight
    *         Ascendant Council
          o             The Elementium Monstrosity can be attacked from farther away than was previously the case.
          o             The damage dealt by Liquid Ice has been increased significantly.
          o             The damage dealt by Electric Instability on normal difficulty has been reduced slightly.
          o             Immunity effects will no longer cancel Gravity Crush.

# Halfus Wyrmbreaker
    *             Shadow Nova is now cast less frequently in 10-player modes to account for fewer available interrupts there.
    *             The captured drakes in this encounter now apply Dragon's Vengeance when they are killed instead of when they are freed. To account for this change, the health and damage of the drakes has been reduced, and the damage bonus gained from Dragon's Vengeance has been increased.
    
#         Valiona and Theralion   
    *             Immunities no longer port players out of the Twilight Realm.
    *             The damage dealt by Twilight Sentries on Heroic difficulty has been reduced.

Blackwing Descent                 

    *         Maloriak

          o             Increased the cast time of Release Aberrations.