4 classes have been confirmed thus far:

The Aegis Fighter which seems to be a sword and shield wielding tank

The Blast Archer which really should be self explanatory, but if not, then.. it’s an Archer that shoots arrows with a bow



The Spell Caster which uses a staff and since the Aegis Fighter is likely a tank, the Spell Caster is likely the healer but might be a hybrid between DPS Mage and healer, who knows, and finally

The Twin Striker – a dual Axe wielding dude that may be able to wield dual swords and other weapons as well. Dunno yet.