At the moment, I'm strongly leaning towards the Girl Power playthrough:
Female Qunari Warrior - Tank. If I can do a 2H tank, I will.
Cassandra - Melee DPS
Vivienne - Healing and debuffing
Sera - Ranged support and control
I'm also going to have to go at least once for full Mage Supremacy:
Female Elf Mage - Debuff and Control
Vivienne
Dorian
Solas
With Blackwall dropping in and out, since he seems like he'll be the best tanky NPC. This playthrough would probably be incredibly pro-mage and pro-Dalish, and anyone who objected would get their asses dropkicked out of the party, so it might not stay full magic forever.