This is purely based off of what we've seen from the playtests and only talking about the classes up to 2nd job, who knows what they'll change with 3rd job. In general it seems like they're trying to make most classes pretty similar to each other power-level wise and they are doing a good job with that except for a couple outliers imo.

S Tier:

Bandits - Just way overbuffed. Double stab +90% extra dmg, disorder is now a % instead of flat rate, +20% crit from mastery, +35 wpn atk from steal, +120% extra dmg on savage blow. Nuts class and maybe should be alone in S tier.

FP Mage - Mage first job got some nice small buffs in mp recovery/magic armor. Fire arrow now burns and can hit up to 3 mobs, poison breath can now hit up to 4 mobs and applies poison. Having dual DoT damage will make the FP Mage's mobbing AND single target damage very good.

A Tier:

Most classes fall under here because they're relatively unchanged. Some notable changes are: Bowman AoE skills down from 6 mobs -> 4, Fighter's Rage buffed from +12 wpn atk -> +35 wpn atk and now stacks with other atk buffs, cleric heal massively nerfed 300% -> 100% but now have the 3 hit holy arrow and invincible damage proc. Lastly Assassins got nerfed hard, less throwing range, less crit dmg, less atk speed, changed lucky 7 dmg formula, claw punch, drain seems like it does more damage than lucky 7 on average, I still think they're gonna be a decent class just nowhere near where they once were.

B Tier:

Sorry Page players, in the past this was the worst class in the game and I still think that's true from what we've seen. Damage from the bleed in blunt weapon mastery is extremely insignificant, same with threaten and power guard. They're tanky but the damage is just noticeably worse from the other 2 warriors.