All Model 3s produced so far have come with the premium interior. It's likely that once the premium interior is no longer required that the Model 3 will come with a "cheaper" sound system with fewer speakers.I hear reviewers rave about the Model 3 sound system, do you think this is something that inevitably will get replicated in both the X and S inevitably?
With that said, the premium package for the S/X also includes the premium sound system. Previously, it was a separate package.