So we don't know all the changes yet but if you want a good bet on the most OP classs in any RPG pick rogue. Be it a pc/ console game or any tabletop dog you'll be right 90% of the time or more. The other 5% is split between wizard and hunter.
What it wont be 99% of the time is your fighter type character with a giant axe that should split trees.
How I think dos should scale
Barbarian / melee fighter - most risk
Rogue - high risk but sneaky and dodgy. Rogue should only be highest dmg if they are at risk because lower life. Don't get me started on all the games where rogue can be the best dmg and tankiest at the same time.
Wizard / hunter - low risk. Away from the direct battle. More utility options.
Knight / paladin / cleric- high risk but high dmg mitigation.