Someone decided to show the entire artbook for the game early on youtube:
- Confirms PvP is Marine x Marine only (The artbook shows classes.)
- There's Banner and Clan customization for PvP
- Seems there's a base area which you go to upgrade your main character and pick story missions.
- One of the main characters is named Chairon
- Shows the enemies,levels and bosses (Multiple types of Tyrandis and Chaos Marines)
- Shows all weapons, vehicles and interactive objects (Knifes, boltgun types etc)
Source