Firstly i'd like to say, that blizzard stated that the changes made would NOT make all the classes the same... but with this recent update, thats hardly true.
The tanking changes below are:
Frenzied Regen = Last stand (Basically the same as a warrior, it just happens to include a regen affect at the same time...)
Survival Instincts = Shield wall (This is kinda obvious)
Feral
•Frenzied Regeneration now Increases maximum health by 30%, increases health to 30% (if below that value), and converts up to 10 rage per second into health for 20 sec. Each point of rage is converted into 3% of max health.
•Savage Roar now increases autoattack damage done by 50% instead of physical damage done by 30%.
•Bash no longer interrupts spellcasting for 3 sec.
•Enrage now increases physical damage taken by 10% instead of reducing base armor.
•Survival Instincts now Reduces all damage taken by 60% for 12 sec. Only useable while in Bear Form or Cat Form. Instant, 5 min cooldown
•Heart of the Wild now increases your maximum mana by 5/10/15% instead of increasing your Intellect by 2/4/6%.
Kitty cats also lose the 30% damage increase to all abilities, now its only auto attacks which isnt as good even if its 50%!
This is just my opinion but when cata starts, all the tanks will be able to do the same stuff... Won't matter if you pick a warrior/druid/paladin, Same Cd's same amount of defensive abilities, same amount of mitigation.
Obviously more will change before Cata is released and i'm aware of this... however the changes so far don't inspire much confidence in blizzard.