I spoke to a rep at RamTrucks, and they called my dealer's service department to ask them about it ( ? ). I didn't ask my dealer directly, because they were the ones that told me this wasn't going to be an option on the 2016s.
They said it's a different wiring harness and cannot be done, even after I asked about installing the different wiring harness. No further explanation was given, or available.
Considering they installed an integrated brake controller after-the-fact, activated the NAV after the fact, and when you select the $100 Auto Climate Control option on a 2016 it doesn't say anything has to be changed even if you have the basic radio. Seems to me it would be a bezel change, software update, and maybe some sensors installed...