Also look at arms warriors on raid bots. Raiding and PVP are very different.
I think everyone can agree this was a pve buff. I dont know how they could have buffed pve without buffing pvp they didnt include any counters to offset the pvp effects of the buff.
My guess is they are tossing these changes in now to get a good foundation for the next pvp season so they can figure out what they want to adjust for that.
P.s. Honestly better t0 do it now then the start of the new season.