So what are the implications of this in PvP? With the exception on Atonement, this is a decent buff to off-spec healing, so retribution paladins, shadow priests, warriors, elemental shaman, rogues, death knights, warlocks, monks can all expect buffs to their healing in PvP from this. This may be an attempt to aid the nerfs to offspec healing, which meant that offspec healing didn't benefit from PvP Power.
The change to Atonement is an interesting one, as Atonement is only used very occasionally in arena PvP. Perhaps, since it is now a baseline ability, Blizzard is trying to improve its viability for PvP healing. What do you think?