Well, let's take what they've said about healing changes into effect. Everyone is going to have significantly higher HP in comparison to encounter damage. The challenge will be keeping up with the damage while keeping up with mana, alternating between throuput/output. If I recall correctly the idea is that very rarely will the healers get the whole raid topped off without ooming themselves completely. Perhaps blizzard will take this to tanking, and kinda eliminate the "Tank Killing Laser of Doom!" idea and just kinda go with: Hey, bosses hit kinda hard, rotate CD's or meet with certain demise!
Really, I don't know a lot about hunters and the only good advice I can give is: TURN PET TAUNT OFF! ~Aggathon