I remember reading that the idea in Cata is for no one to be at full health , most of the raid will be injured all of the time , even the tanks .
Lots of constant damage and no , nearly dead to full health healing , just a matter of triage, and keepin the tank as high a possible , i like the sound of this, but im sure it will bring on a swearing fit of mammoth proportions when i have to heal on my Priest lol.
And for non healers it's no more standing in stuff and not being worried as ill catch a heal soon ..those days are gone i think