The forthcoming 780G already has bluetooth, presumably for display on phones. It would be a straightforward firmware upgrade to add data access and dosing commands to the interface, of course followed by getting FDA approval for the ACE designation as you mentioned.
The 780G is described at https://diatribe.org/news-medtronic-hypoglycemia-prediction-iqcast-sugariq-and-timing-next-gen-minimed-780g-closed-loop where they mention automated bolus for corrections, bluetooth, remote monitoring for caregivers, software updates, about 2 hours better time in range than with the 670G, and having the Guardian 3 sensor approved for non-adjunctive use (no confirmatory fingersticks.) But I bet the 780G is still upside-down, because they would have to admit they were wrong to correct that.