UPDATE: This nerf has been confirmed.
Many Holy Pallies have been commenting on how strong the T14 4pc bonus is – so much so that Holy Pallies currently raiding in Throne of Thunder are going back to try and get heroic tier tokens (for those with only normal tier, or worse, LFR tier) so they can maximize their stats while still retaining their T14 4pc set bonus. Not only that, they are eagerly awaiting and saving valor points so they can upgrade any non-upgraded heroic tier pieces with the valor upgrade system for when 5.3 drops.
Pallies are also faced with the problem that unless their helm is already heroic (which many don’t, since it dropped from Heroic Sha in Terrace), they cannot equip the legendary meta gem, which requires a minimum 502 ilvl.
The current T14 set bonuses are:
While the lacklustre T15 set bonuses are:
Even with the reduced stats, people are getting more throughput from the lesser ilvl T14 over the T15. And since Holy hasn’t seen a buff or change to the current T15 bonuses, it is starting to appear that Blizzard just might nerf the T14 bonuses to compensate.
Here is the complete Twitter thread that discussed a possible nerf, and the T14 > T15 issue.
Playing the game with old tier sets, and hoping Blizzard doesn’t nerf them, is always a dangerous game, since Blizzard doesn’t seem to have a problem nerfing previous tiers bonuses on a moments notice. If you are a Holy Pally and have stuck with the old tier while passing on T15 tokens, I would suggest you start collecting tier and using coins to get the new T15 ASAP.
Some discussions on the over-poweredness of T14 over T15 and the possible nerf:
Holy Paladin T14 vs T15 (Blizzard forums)