I wrote to BMW to check when I'll be able to order the parts. I just got this back:
Thank you for contacting BMW of North America, LLC regarding BMW M Performance Parts for your new 2014 BMW X5. These parts should be available for order through authorized BMW centers within the next month. We suggest keeping in touch with the parts team at your authorized BMW center for the most up-to-date information. Should you need it, a list of our authorized BMW centers is available at:
www.bmwusa.com under “Dealer Locator.”