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It will be a while before another "big refresh" Tesla does not operate that way... You will get a bunch of little enhancements year to year, but not major refreshes for a while.
Some enhancements that are rumored for the Model X are:
- Updated Yoke/steering wheel with center horn (already shipping on 24' vehicles)
- Front bumper camera like on the cybertruck
- interior rgb lighting like on the new Model 3