Well, let's hope they learned their lesson from Cata and will make them harder the proper way this time.
Ie you don't up the difficulty and gut the healing at the same time.
Early Cata heroics was the best fun I've had in small group content since the early days (I was a tank) at the same time I could sympathize with my healer friends (some of which I've been playing with for years and are not in the least squeamish about wiping or hard content) who felt entirely powerless to support the group.
They couldn't do triage (pick who survives, the tank or the bad dps) because soft-enrage mechanics and even when the encounter or trash group did allow triage the mana changes made them go oom in 10sec.
That was the bad design choice, not upping the difficulty, if they'd given healers some leeway to carry groups and not go oom in 10sec for the transition period while dps (as a whole) gets it into their heads that this is a new ball game where you need to focus targets, assist and (the horror) occasionally cc it would have been fine.
Good idea, bad implementation, I have hopes they will do it better this time around.