Game on

Warriors :
Cassandra - two handed. As a seeker, she may have access to Templar abilities, and smite seems to go so swell with a whirlwind attack.
Blackwall- sword and shield. Being a grey warden, this style of fighting just seems natural to me, given it's flexibility ie a shield can become a weapon and a weapon a shield

Iron Bull- two handed. However, if our companions have racial bonuses added and if the qunari bonus is now a melee defence, a sword and shield Bull would likely be a potent meat shield in heavy melee combat.
Rogues:
Varric- after reading the dark horse comic, Varric will never put Bianca down. That, and it's a unique weapon and he is a ranged dwarf, different to the norm and I like that.
Cole - he will exist in my party to fade away and slice my enemies with poisoned weapons.
Sera- watching the videos, I admit, archery just looks so good on her, really does justice to the elf and bow trope. And she can let off cheeky comments from a safer distance.
Magi :
Vivienne- ice ice baby ! This lady will bring winter to the battlefield. If that's not enough prepare to be burnt to a crisp.
Solas- his spec, which I'm assuming to be rift magic related, will be his focus. Barrier and CC spells will be his other talents *STATIC CAGE*
Dorian- I read that Gaider said Dorian is a master of powerful elemental magic. As such, it would seem fitting to have him conjure flame, lightning, stone and ice in addition to his necromancy.
My Inquisitors:
Dalish Rift Mage. She will invoke Winter, stone and rift magic. Hoping for some creation magics too.
For this inquisitor, I forsee a party composition of three elves and one bull being popular.
Human Templar. Two hander, good armor and Templar skills. In demon / fade heavy battles, I see Solas, Cassandra, Dorian, Cole and Varric being handy companions to have.
Third Inquisitor will likely be a Qunari knight enchanter or a human necromancer. Unsure yet.
Though if Qunari knight Enchanter, Funquisition party it is