The last time that I recall seeing and owning a BMW with a blue (dark) leather interior was the E30.
BMW, like other manufactures, spends lots of money doing market surveys for exterior/interior colour choices before offering them to the public. You can be sure that a bright blue interior will be as likely an option as yellow ! A darker red than Coral Red would be a more likely future choice or maybe a return of Natural brown ?
2016-328dX Touring M Sport, MPP, Glacier Silver, 18" 441M Ferric grey alloys