Along with Revival being buffed in 25M raids, Tranquility also got a nice buff for 25M raiding, including symbiosed versions of the spell as well.
Tranquility
now targets 12 raid members (up from 5) each time it heals when used in a 25-player instance. This change also applies to players using the Symbiosis version of Tranquility.
This will make non-resto Druid tranquilities that much more powerful for 25M raiding, where the off-spec Tranquilities from Boomkins, Ferals and Guardians are not generally used as often as the resto Tranquilities. Unfortunately, the non-resto Tranqs did not see any kind of CD reduction, which generally makes the non-resto Tranqs usable 1-2 times per fight.
The change also applies to symbiosed Tranquilities for Priests, which adds a nice buff for them as well when they are symbiosed.