What's your predictions for each healer for 5.0 ?

[Sylvain]

So, imo something like this will happen

Healing wise
All healer will be viable. SCH seems slightly overtune especially with the dome regen and on demand crit (even the critlo is nerfed)

DPS wise (including raid buff)
The meta will probably still be SCH+AST, however it will not be as strong as it currently is simply because both SCH and AST buff have been gutted. The 10% crit will not be super powerful at the beggining of the xpac.
Regarding WHM, I think SE utterly failed at making them easier. I think they'll be the hardest healer to play to achieve great dps. (and thus contribution)
SCH dps has been super simplified and his most potent tools are still ogcd, SCH will as usual try to minimise their gcd use to the bare minimum
AST dps will slightly go down (relatively speaking) with the absence of the Lord. On the other hand their dps will be very stable.

WHM however, with the addition of Afflatus spells will either have very high personal dps or on par with SCH/AST.

WHM dps tool are stronger than their coheal counterpart, however they can't weave as effectively as AST and can't don't have access to good ogcd.
With the new afflatus spells being all instant, two kind of WHM will arise.
Those who manage to have very high uptime by keeping their afflatus for movement / weaving
Those who don't

One crucial thing to concider, if a WHM uses his 3 afflatus while standing still and not weaving anything, then their Afflatus Misery is a very low dps gain. Yess it's 900, but 900 over 4 gcd. so 4 Glare > 3afflatusheal+1mysery
On the other hand, if WHM manage to use their Afflatus while moving or when healing is necessary. In the sens that No matter what happens, they could NOT be casting Glare on that one GCD, then their dps will be off the chart. I'm specifically pointing that they would use Afflatus spell when casting a Glare is not possible. That means the Afflatus-heal isn't concidered a dps loss (since you could not cast a Glare anyway). Which implies that their Afflatus Misery could be the equivalent to a 900 potency ogcd. (Remember, I'm considering they would cast those spell when they could NOT be casting Glare.)

Adding up their spells being quite stronger than other healers, I think very good WHM will be able to dish some truly amazing numbers. (I don't think that would be enough to compensate SCH/AST of equal skill tho). And if they'll be playing with good coheal who with proper ogcd mapping and stuff. I wouldn't be surprised to see them with very consistent DPS

However this is against what SE seems to aim for WHM... to make them more simple? If anything SCH and AST will be easier to optimise.

MP management
AST not having access to the Ewer, Extended Lucid Dream / Light Speed, they will remain the healer with the worst mp management (400mp per dps skill)
SCH will have an extra 1000mp every minute in the form of Aetherflow, granting them more leeway. (Effectively 2.5dps skill worth of mp every 60s)
WHM will have an extra 1000mp every 45s, as well as 12s of unlimited mp every 3min.

According to people who have attempted Titania, heavily spamming your offensive skill will make you burn through your mp. (For the first patch at the very least)
With the removal of mp song and mana shift, healer won't have "back up" mana and will need to be careful.

The WHM staying the healer with, yet again, unlimited mp, will surely make it quite valuable during early prog, allowing for more dps oriented gear.

So while in perfectly under control situation, all 3 healers should be fine, it is really important to consider that the WHM being the only healer with no mp issue may (or not) be a serious thing to consider during prog.