First off here is some infor Namco gave us on Code Vein

The new trailer highlights the mysterious and captivating universe found in Code Vein along with a quick look at the game’s thrilling weapon-based combat. The trailer also teases the game’s companion gameplay mechanic. As players venture out into the world, they will be able to choose a partner companion from the various residents of Vein. Added strategy presents itself when players choose companions that complement their play style to give them a fighting chance against the vicious enemies they’ll be up against through their journey.

In the not too distant future, a mysterious disaster has brought collapse to the world as we know it. Towering skyscrapers, once symbols of prosperity, are now lifeless graves of humanity’s past pierced by the Thorns of Judgment. At the center of the destruction lies a hidden society of Revenants called Vein. This final stronghold is where the remaining few fight to survive, blessed with Gifts of power in exchange for their memories and a thirst for blood. Give into the bloodlust fully and risk becoming one of the Lost, fiendish ghouls devoid of any remaining humanity.
You should check out the trailer below-