I'm somewhat expecting it to happen, but I'll still end up being annoyed by it
If it turns out that people like Iron Bull (and Dorian/Solas) does have a spec like Reaver I hope it's a mix of both DAO and DA2 (like give Cass a Seeker spec, Cole a spirit-type spec, etc)
Even though I don't think it would be too out of character since the Chantry-Seeker relationship before schism, the abilities Cassandra used in the PAX demo suggest she's actually a Champion. (Namely the Banner ability, to say nothing of her Sword/Shield combo)
That would make Blackwall the Templar. Given the strange status of the Templars in DA:I (Basically uncontrolled aggressors) Blackwall probably identifies himself as a Warden, who was trained as a Templar. Much like Alistair, feeling no real solidarity with the groups politics or ideals.