The changes target both player character progression/abilities as well as mission and monster variety and difficulty. Here's the list of the new/improved features for the update:
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Monstrous hordes have emerged from the realm of nightmare to terrorize the town of Lorwich, Virginia. And lucky us, we get to take part in the terror by battling those vile minions! Alone in the Dark: Illumination kicks the action up several notches and favors a more shootey style of gameplay, a marked difference from the original game's quiet, ohmygodwhat'sbehindthatdoorHELP atmosphere. Gone are the jagged polygon models (aww), replaced with more modern characters and lots more things to shoot at/with. Four character classes facilitate the co-op action, each adding their own skills, weapons, and powers to the team: Hunter, Witch, Priest, and, wait for it, Engineer!
Alone in the Dark: Illumination will feature a 4-player co-op mode featuring four unique classes. In this mode, players must work together to save a tower under The Darkness' spell. Playable classes include a Hunter, Witch, Priest, and Engineer. Each class has unique weapons and abilities, such as the Hunter's flamethrower or the Priest's ability to heal wounded allies. Players will work their way through a co-op campaign and face off against a god-like boss at the end.