TL;DR: DK looking like top tier class, bug fixes, warriors are dogshit , insane disc buffs, paladin nerfs? blizzard realized with the blanket and instant cc they'd have to cast more. Patch is looking insane, I suck at editing and might have missed something. Lmk.
I can't really remember a time when mages were a bad class, or weren't "viable". I think they will be fine with the upcoming changes, not as good as they are now. But still will be very good when paired with another CC oriented class such as Rogue or Shadow Priest.
Ferals just need cd on instant clone(20secs) and nerf burst with oneshot macro, but if u cry about feral dmg.. you need to cry about warr damage, sp support, dk perma dmg, hunter perma dmg/cc but ye, ferals need some fixes