I can almost guarantee you that there is zero chance of feathers happening prior to Dominion's premiere. Given that the Dimorphodons lack pycnofibers and that Frontier continues to put in new naked pterosaurs, I wouldn't be surprised if they never bother with any feathered or furry creatures aside from the ones featured in Dominion, if even those. I really want to be proven wrong though. Best case scenario is feathered skins for all of the coelurosaurs and furry skins for all of the pterosaurs, but with each new pterosaur added, I find it harder to believe that this will happen as it'll require a much more massive update / paid DLC after Dominion premieres.