It could include new uniforms / armour to mod and upgrade your character's look with (people love to make their characters look unique - I know I do). Will include character weapon combo choices that we can upgrade / build. You could choose to be a member of one of the gangs or affiliated to a settlement.
It could also include a motorbike race (with roll cage & spikes) as an extra race option to push that side of the game...
I seriously want to see some dlc for Rage and I'm thinking of ways that would bring mass audience to the game. I really love the game and I loved the imagination and environment. I just think they need to expand on it to make it stand out so it doesn't seem like "another" fallout or Borderlands. Rage is different as it has all the technology and industry still available. It is the stable government and society that is lost. Its more like the Empire v's the Republic in Star Wars only set on Earth and not in space.