I'm thinking just like the rest of the game is rng. I'm thinking they may implement marks for each level you pass and then head to the new hub to meet Mark the vendor to trade in your marks for weapon and gear.
They will most likely have it like every other vendor in the game. You get to rank a million before you can get boots,gloves, one shader, and an armband, cloak or apron, and another million ranks to get a rare shader and helmet, weapons and body armor.
Let's see how this works.