So I've had this thread up over in genera discussion regarding a survey I've put out about (which is also over on Reddit), and while it's still a little early, there's a decent amount of healer feedback. The main part of the survey is a 'check all that apply' list of what changes a player wants to see followed by a follow-up that asks that player to select which of those is the one they care about the most. Here's where each healer stands currently as of 9/30:

White Mage
1. New Attacks (64.2%)
2. New Group Mitigation (11.3%)
3. New Lily Actions (9.4%)

Scholar
1. New Attacks (61.1%)
2. Faerie Gauge Changes (13%)
3. New Faerie Gauge Actions (9.3%)

Astrologian
1. New Attacks (27.9%)
2. New Draw/Play Actions (23.3%)
3. Arcana Gauge Changes (20.9%)

Sage
1. New Attacks (72%)
2. New Addersting Actions (10%)
3. Tie [Upgrades to Existing Actions/Addersgall Gauge Changes/Unsure] (4% each)

It's still a fairly small amount of responses so far, but I think it's interesting information so far.