While we obviously don't know anything about what the DLC will consist of, I would like to take a moment to put this out there.

For DLC, assuming it consists of new warriors/factions...
Native American warriors...
Broken down as such.
Assassian- dual wielding or single wielding dagger.
Vanguard- utilizing the tomahawk.
Heavy- using the Aztec Macuahuitl (a large wooden sword inlayed with obsidian)
Hybrid- using a Native American lance.

Another suggestion is to include Chinese warriors or Mongols as another set.

The 3rd and last one I have is to include Roman legionnaires.

But if only one gets picked please pick the native Americans. There is a history of them fighting off the Vikings after all...