What's shaping up to seem like it will be more in demand in TWW, tanks or healers?

I usually play healer but don't mind tanking and I'm stuck between maining a priest or DK/monk as my first character. I like to play what's most in demand so I'm thinking if healers are going to be more rare I stick priest, if tanks, then either monk or dk.

Any idea which will be more scarce based on community feel given recent changes?