[2019] The salespitch already made me 90% wanna buy

So the game is coop shooter like left 4 dead. How does progression earned? Will the class level up and unlock abilities? Is there loot of some kind? Is there a variety of weapons? Does the horde of enemies comes like ai director of left for dead? Ie random and chaotic. Does it has built in chat wheel like left for dead? Sometimes I just do not turn the mic on.

Thank you