Just a question for my own interest. Are your sufficiently satisfied with the Shaker system and/or modes you can make, or are you waiting for the B&O Play system like me?
I don't think Ford has come out and expressly said that B&O Play wasnt going to be on the 18's... I mean both the Challenger and Camaro offer high end "audiophile" grade sound systems so to stick with the underwhelming Shaker system exclusively is not exactly smart.
From Automobile, September 2016:
While Ford will continue to use Shaker audio systems for the Mustang, a Ford spokesperson confirms that anywhere you currently see a Sony system (Focus, Fusion, Explorer Platinum, to name a few) it will soon be replaced with a B&O Play system.
I was hoping that maybe we would see it in the Mustang in 2019 (or before).