MOONKIN FORM: This form now also reduces the damage the druid takes while stunned by 15%.
Ghostcrawler mentioned recently that the main concern for Balance PvP isn't damage or CC -- it's just survivability, pure and simple. This is a very welcome change in that vein, although I'm surprised that it went to us over other casters, who are arguably more vulnerable to melee stuns. Well...maybe not. Shadow Priests have Dispersion, Warlocks have Demonic Circle, Mages have Ice Block and Blink, and so on. All of these are instant-cast, which might be part of why they're more effective "Oh s^$t!" buttons than Roots and Cyclone, both of which can be interrupted and silenced. Travel Form leaves you more vulnerable than you are in Moonkin, Bear Form has limited options given that most moonkin PvP builds I see still don't put any points in Feral despite the change to Survival Instincts, and Nature's Grasp -- well, you have to get hit for that to trigger that anyway.
We'll see if this helps, although if the root of Balance arena issues lies in the vulnerability of caster form (which was one of the factors driving the "tankiness" of Trees in Season 6), this change just nudges the Druid to stay in moonkin more than they already are. Still, I'm curious to see what effect this will have.