It will be interesting to see the potency and cost of all of these new spells. I don't necessarily envision a CON that has a ton of free time and MP, but I do see the possibility of a stronger stoneskin, stronger base cures, and greater damage mitigation from the tank, as well as additional options for the DD to recover small amounts of HP lost from incidentals.

I personally would rather that SE did not state a vision. I understand your concern about working on Materia, but that's why retainers across Eorzea are currently sitting on over 100 grade 3 and 4 materia each. Even with a statement of vision, it will be difficult to know the best stats for your class, aside from the obvious. Plus, the way it is we get to decide what our role is in a group (to a degree, I don't expect to see DD CONs). Let the players decide what works best and let SE sit back and say, "We never saw ninja tanking as an option when we..."