Not enough info on the companions to really make any official decisions yet, but so far its looking like:
Setup 1 (canon/first/main/likely setup):
Qunari Mage Inquisitor (female)
Iron Bull (fellow warrior)
Varric/Sera (rogue)- will switch up between them depending who I like more
Dorian (mage)- the lucky LI I'm planning for my FemQuisitor should he be so inclined...should Iron Bull be (likely) unavailable
Setup 2 (elves ftw):
Elf Rogue Inquisitor (Male)
Solas (mage)
Sera (rogue)
Iron Bull (warrior)/Varric (rogue)
Setup 3 (human men of action/sausagefest):
Human Mage Inquisitor (Male)
Grey BeardWarden Featherduster (warrior)
Dorian/DHMG (mage)
Cole (rogue)
Setup 4 (girl power):
Human Warrior Inquisitor (Female)
Cassandra (warrior)
Vivienne (mage)
Sera (rogue)
*always at least one girl power run in all my BioWare games 
Setup 5 (The Expendables):
Dwarf Warrior Inquisitor (Male) or Dwarf Rogue Inquisitor (Female)
Beardo McGriffonfeathers a.k.a Warden (Warrior)
Iron Bull (Warrior)
Varric (Rogue)
*yes its horribly unbalanced and mage-less but should be pretty entertaining 
*note- extremely subject to change upon playing through the game and experiencing the companions, this list is for fun and should no way limit or predict my game experience 