Myself and a few people have made some threads on RDM (I actually have the link to mine in my sig), basically most have summed up thoughts that the current and future FFXIV system will make it impossible for RDM to be a carbon copy of FFXI's RDM.
The spell/job ability limitations are so restrictive they would have too combine the aspects in order for RDM to even be the least bit viable at anything and maintain the basic status quo of melee and white/black magic user. So in hindsight if RDM were to come out it would probably be built like this.
1-2 Heal spells
3-5 Buff/Job abilities
3-4 T3 Magic Sword Combos (Example: Burning Blade > Red Lotus Blade > Flare Blade)
-or-
1-2 Heal Spells
3-4 Buff Spells
1-2 Job abilities
1 T2 Sword/Magic Sword Combo
2 T3 Sword/Magic Sword Combo
Proving they don't do away with combos all together, I imagine they would be set up somewhat similar. In any case they would have to try really hard to mess RDM up in the same manner they did FFXI's RDM, and that's because they don't have all the freedom and guesswork that they had to deal with in FFXI like skills levels, EX weaponskills, mostly unlimited magic pools, retarded boundaries of skills etc.