Soldier – Soldiers are Combat specific characters.
Engineer – Engineers are Technology centered characters.
Adept – Adepts are characters especially skilled with Biotic abilities.
Infiltrator – Characters who blend their Combat and Technical abilities.
Sentinel – Characters who balance using Biotic abilities and Technology.
Vanguard – Characters who mix their skills at Combat with their Biotic abilities.
We will have more on the different classes in upcoming updates. So stay tuned.