A huge change hit the PTR for monks, with Revivals healing being reduced by 30%. This is a pretty significant change, and is getting lots of reaction on the forums. However many people see it as just being a way to compensate for the fact they couldn’t nurf monks mana costs.
But really, of all the healing cooldowns, Revival definitely was most bang for your buck. It didn’t require you to channel and it can easily hit for 5-6 million in healing if used on a 25 man raid that have the majority of players with pretty low health. and if you or any other healer class, and you happen to pop your cooldown the same time, chances are pretty good your output would be pretty low.
Later, blizzard also commented on the reasoning behind the change.
What was the reasoning behind the nerf to Revival (MW monk)
Because it was instant, it was significantly better than Tranquility or Divine Hymn. It solved too many challenges easily. (Source)
It will be interesting to see if anything else gets nurfed when it comes to monks in 5.4.