They did change Ret mana regen, but gave feral no compensation. Ret gets spell power based on attack power, we get spell power based on 70% of our agility (even though gemming/enchanting for str is our best dps choice), on a talent which gives NO other benefit, unlike paladins Sheath. They also get instant Flash Heals for incredibly low mana, where as our nourish (flash heal) costs us 10% of our mana. Also...
http://www.wowhead.com/?spell=48782 Compared to...
http://www.wowhead.com/?spell=48378
1000 extra healing just there for less mana.