I can't see RDM getting any more support White Magic. Like they definitely won't get a AoE Cure. Maybe a Veresuna, if anything, but RDM historically could never remove every ailment, only a few. So perhaps they will get a Vercleanse which will allow them to remove only the debuffs that medicine can remove (Poison, Paralyze, Blind, Silence).

As for heavy hitting spells, RDM probably won't unless its a finisher. Their damage comes from melee combos and finishers, not the in-between spells. Black Mage is meant to be the heavy spell slinger. Maybe RDM will get a trait that allows Verflare to proc Verholy and Verholy to proc Verflare (kinda like how 4.0 DRG could proc their other 4th finisher after landing the first 4th finisher with the Lance Mastery trait). 1200 potency in 2 GCDs would be pretty crazy.