Dual Bluetooth - two separate Bluetooth devices simultaneously

Since everyone here is just a fellow user of Apple products, nobody here can say anything about what Apple’s future plans for iOS, iPadOS or MacOS will, or will not include. You will know when we all know, which will be when of if Apple ever announces support for such a feature.

Speculation isn't permitted on this forum and Michael is correct in saying that no one here knows Apple's future plans, if Apple will or won't open up dual Bluetooth connection simultaneously.

Use this link however, to express your thoughts to Apple on this as it will be read by them, but they won't respond back to you.

click here --> Feedback - iPhone - Apple

Exactly what do you mean by “two separate” Bluetooth devices? If I understand correctly, I am doing this today with my 6s. If I am in my car and also have my earphone in my ear, an inbound phone call will ring in my ear and in my car.

Whichever “Send” button I press will draw the phone call to that device. Likewise for outbound calling. A BT LAN can typically have up to 8 members, including the hosting device. However BT only supports one simultaneous voice path. So, you can have as many as 7 devices communicating with your iDevice at once, but only one of them can be passing audio at a time.

Does this help?

You can pair more than one device and store that info in the settings but you can only use one connection at a time.

Only one device at a time in iOS.

I suspect the OP is talking about running two sets of Bluetooth headphones at the same time as an example. Which isn't an option in iOS currently.