With this last round of Design Studio changes, the standard headliner has been removed as an option altogether. Now you get white alcantara for free, for you upgrade to Premium Interior to unlock black alcantara.
First noticed (that I can find) by @Fanatic here: Turbine wheels now mandatory with P85D - intentional change or design studio glitch? - Page 5
First noticed (that I can find) by @Fanatic here: Turbine wheels now mandatory with P85D - intentional change or design studio glitch? - Page 5