Paladins are melee, priests with holy damage would be casters.
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They already changed disc priest from what is been up for 10 years. It is totally diferent from Cata, where i played the class, i rmemeber Firelands and Dragon Soul, man the healing of Power Word Shield was stupid, so op.
Also, classes change all the time. Take Survival Hunters for example.
Also, i said to mix disc heals and holy heals so people who enjoyed disc heals wouldnt be sad.
IMO they should make all specs able to DPS with a talent tier or two that significantly re-align gameplay by increasing DPS capabilities and decreasing healing capabilities.
Even more attractive to me would make a skill system where you select actives and passives and builds go through ups and downs based on the current state of the game. That will never happen in WoW, however.