Lightfall Anual Pass

So I shelled out the 50 bucks for the Lightfall preorder on steam as soon as it came out (really wanted the emblem) but couldn't afford to get the annual pass edition.

Now I've saved up another $50 (to get my hands on the sick looking auto rifle) but I can't find an option ingame or on steam to buy the pass separately. All I could find was the option to pay $100 and get Lightfall again.

Does anyone know if there's a way I can do it now or if the option will become available when the expansion comes out?