News about Dark Messiah multiplayer mode were posted on the official Might and Magic portal. The news focused on the various classes that will be available in multiplayer mode : warrior, assassin, mage, priest and archer. At the moment, the news is only available on the french and german portals. Here is a quick translation of the classes' description :

Assassin : he has skills in both melee and stealth, but his physical strength is weak. He hides in the shadows to strike quickly. He's good with poison, resistance, traps, invisibility and silent moves.
Warrior : A true force of nature. Strong in melee combat, he rushes on his foes, protected by his endurance and shield. His skills : he strikes hard, runs fast and resists well.
Priest : Weak physical condition. She masters defense and ranged attacks. She's here to help her team, by sensing the presence of assassins and casting healing spells.
Mage : Weak physical condition. He has strong ranged attacks and his spells can strike a whole group of enemies. Skills : by gaining experience he improves his existing spells and learn new ones, and gain a better resistance.
Archer : Weak physical condition. He can shoot from afar with deadly precision. Can deal massive damage to a single target. Skills : quick reloading, zoom, multiple shoot.