Honestly, I want something useful. They can keep their figurines and comic books.
How about do what MW3 did.. and include the Season Pass with the Hardened Edition? How about an exclusive Camo or Customization element....and by exclusive I mean will not be released to the public in any other form or manner.
One thing I don't want- Early Map DLC. Hear me out on this. Free-Fall and Nuketown 2025 were a waste to get early. Why? Because you could only play them in a limited capacity in a very limited playlist or in Private Matches. It does us no good to have maps we can't use.
In addition, I'd wait to see what you want to ask for until we know a bit more about the game. There may be a cool element in the game you'd like included that we just haven't been made aware of yet.