What I want to hear the most that I feel has the least chance to be mentioned is tanks being changed up to no longer be able to heal and instead will focus on damage mitigation.

Melee DPS will focus more on being selfish DPS. Physical/Magical ranged will bring more support. BLM is obviously the exception here.

GCDs will become a healer's primary resource to heal. OGCD heals on a short cooldown will be adjusted to provide support. High potency oGCD heals will have much longer cooldown timers. WHM benediction will not go on cooldown if zero HP is restored and it cannot be used outside combat.