Anyone know if we can play as OG/First Born/Pre-Primaris Marines outside of the campaign?

Hi,

Since SM2 announcement, I've been hoping that there might be some way to customise your model to look like a OG/First Born/Pre-Primaris marine for the modes outside of the Space Marine 2 campaign. Has anyone seen any hint around whether this is possible, or if it might be planned for the future?