To be honest the market is pretty diluted with people building parts for the car, it's not like a normal Subaru release. I can think of at least 20 vendors alone making exhausts. At this point about every exhaust and intake design has come out, I'm not sure where they would differentiate themselves. You also have a bunch of domestic vendors who normally do not make Subaru parts in the ball game.
Without the access port I don't see the incentive.
I for one would like to see them make parts but I'm not optimistic.