I have a lot of experience as a feral kitty in both pve and pvp.
these are my thoughts on the SOD runes
firstly, druids are always hybrids and should always be built to play as hybrids. every spec of druid should be healing, shapeshifting, casting spells, dispelling, and everything else.
Mangle: kinda boring, and more of a hassle than anything. it must be reapplied which means its a dps loss for which ever cat has to keep it up. in pvp it just requires an extra gcd and more energy to “set up” which isnt exactly fun
Windfury kitty: again kinda boring. it forces cats to be required for every melee group, but doesnt really add anything to gameplay. in pvp it will be kinda fun to windfury bear attack, but idk not really into it.
resil rune: objectively good in pve and pvp, but doesnt really add anything.
skull bash/savage roar: actively making the class less interesting. going into bear to pummel is a cool aspect of feral. since it shares a cd with bear charge it just makes the easier and less mana intensive. roar: shouldnt change the experience in pve at all really, just like some buff to keep up, in pvp there could maybe be an argument for roar being used in a bear/cat weaving feral, but that seems like it would use a lot of mana.
overall, id have preferred if feral was turned almost completely into a bleed/disease dot build, that shapeshift regularly, if there are going to be massive changes simialr to sod.