Seems PWS and its related talents are Disc Priest's spot healing tools. As such, if they are efficient, they can be quite great, plus PWS has enough of a duration, that a Disc Priest could easily place it on multiple targets before an AoE burst (and grab a lot of mana back). We'll have to see I guess. (It will probably be quite sick in 5v5).
Is it me or Power Word: Shield will become very powerful in wotlk?
Just at level 70 with 2k healing it will be 2375 dmg absorbed, which will return 594 mana, praticaly returning all the mana cost back and on top of that, will do 1188 damage.
health, damage and mana will increase therefore
it will absorb the same percentual damage(or less) then it does now
it will cause the same percentual damage(or less) then it does now
returning full mana is a gift for making this spell extremely mana inefficient as a "healing" spell
Power Word: Shield gains 80% of spellpower which is the same as flash heal gains. This means that in WotlK PW:S will finally scale at the same rate as an instant cast spell. Borrowed Time is useless and barely increases the amount absorbed by PW:S. The change to the scaling of PW:S will make PW:S much more viable, Borrowed Time also only adds 20% of 80% of your spellpower (ie. 16%)