I doubt they will overhaul RDM. Perhaps adjust some potencies/Mana, or modify the bonus granted by Embolden. They're not going to fundamentally change how Dual Cast works. Just make it so it's roughly on par with SMN, damage wise. RDM has instant cast Raises and Cures and can cast while moving most of the time between GCDs, so they can't and won't put it on par with BLM, which is an immobile turret style glass cannon, and SMN gets most of its DPS from instant cast and DoT spells.