While we should expect periodic changes to optimize manufacturing costs, Tesla will get around to a redesigned interior - which is what Musk said on Autonomy Day.
The center console display will eventually be rotated horizontally - since that's the format optimized for entertainment for passengers while the vehicle is in motion.
When they get FSD authorized for use, the driver's "cockpit" will disappear or be de-emphasized, the dashboard display will likely go away (since it won't be needed), the steering wheel could be deleted (or at least made removable) and possibly even the foot pedals removed. When this happens, we should see Tesla (and other manufacturers) shift towards improving the riding experience - items such as displays for watching videos, more power for devices, high speed hotspot and possibly even items like work surfaces or rotating front seats (to face the rear passengers).
We should also expect to see Tesla increase differentiation between S/X and 3/Y. The new battery pack is the first step, and while it doesn't get full V3 supercharging speed, it does increase the range and performance beyond 3/Y. Also wouldn't be surprised for Tesla to add other items, perhaps going back to providing free long distance supercharging (using a supercharger only on road trips - not urban/local charging).
Right now, Tesla is under considerable pressure to get back to at least break even, so unless changes impact the bottom line, we shouldn't expect to see major changes for S/X at least not until next year when the new 1,000,000 mile battery packs with full V3 supercharging support come out for the S/X or Tesla really does get approval for FSD (somewhere).