I warn that this is personal speculation, but if true would definitely be important to know... I believe Protector of the Pack may be bugged.

Saturday night, we did some 10-man 3 drake attempts, and got quite well acquainted with the damage range of his breaths during the dangerous phase, as it was more than my HP (I use a very HP-heavy set).

Sunday night, we go back in with the same comp, and the breaths are hitting about 4k less. I'm not talking resists - I mean the total damage (landed+resist, no absorb). These numbers are from over the course of a few hours both nights, so while I regret not having any WWS proof to "confirm" this for anyone, I am least personally quite confident that something was causing a significant decrease in breath damage.

There was no downtime between Saturday and Sunday night, I had the same gear, group buffs. The only difference was Sunday afternoon, I respecced for PvP for the first time since the patch, then specced back to my tank spec for Sunday night's attempts. And suddenly was taking about 12% less damage from flame breath.

I'm concerned that with the change to Protector of the Pack's mechanics (no Guardian buff now), it may be bugged and not active until you unspec and respec it. I certainly would hate for this to be incorrect and scare anyone into wasting 50 gold, but if anyone has not respecced since the patch it may be informative to put on 0 resil and have someone DOT both them, and something with no spell damage reduction, to compare.

I confirmed last night that (at least against a warlock's Corruption DoT) my Protector of the Pack was functioning properly - I took 12% less damage from the ticks when I shifted into bear form. I haven't respecced since the patch. So, it was at least not bugged for me. I'd like to see a few more people confirm or deny though, since 12% mitigation is a pretty big concern, and there could be other factors than respeccing that cause it to only happen to certain people.

I was working on OS10 last night and I didn't notice any reduction in damage at all. As of 3.0.8, we were experienceing a lot more MT deaths to 1 shot since you can longer twilight dance. I really wish they did increase our damage reduction because it sucks to have a great attemt end due to a 50k breath.

This was a hit to AoE healing, but it really isn't that bad. Nothing a couple of LB's and Rejuv + SM can't help. People are exaggerating about this "huge nerf". I didn't want to go back to spamming one spell (LB in BC anyone?), and I don't think Blizzard wanted to either.

It's not nearly as significant for druids as it was for priests because WG is a HoT while CoH was instant so for instance on Loatheb, you could precast WG 4 seconds before the aura wears off on one group of people, Nourish someone, and then WG a different group. I'm fairly certain (correct me if I'm wrong) that WG has a higher healing value than CoH, so on Sapphiron and Malygos Tornado, it's going to be superior.