If you're going to state something that Blizzard said, best get it right. (No, they aren't going to require only 4-5 healers for a 25 man raid.)
Given they're still balancing around 7-8 healers, and they've added a new non-healing class, I think most guilds will be in exactly the same situation they are in now: beggars can't be choosers, take the healers you happen to have.
According to Blizzard, their goal is to have 4-5 healers for a 25-man raid. Whether or not they get there is anyone's guess, but that's their stated goal.