Seems at least 80% certain the camera issue I'm experiencing is unrelated to the carplay module, more testing will confirm. This isnt that surprising as I do have issues with my camera (likely potentially water damaged related). Today for the first time I put it in reverse and it behaved as expected, went from Car play into my camera, and back again.
I've also just been sent English translated firmware for the "top" menu so I can understand better what this can do. So far I can already workout theres Apple Car play, Full iphone Mirroring, and Androids version of Carplay. There are 2 other things in the menu which I cant workout yet which I'll report back on.
as a reminder if you have 3G MMI this will not come with a camera, if you dont then it will I think and would safely presume it to work. I also assume youre not familiar with carplay? It is basically your phone in your car, only with limited apps. So as you'd expect, when you get a call its handled through carplay. Blutooth is simple an "alternative" audio connection (ONLY if already available in your car- this has NOTHING to do with this module). By default you have to set your media to look for Aux to get audio from the phone, and by default your phone when plugged in will switch to playing over USB. In either case if you switch both your phone and car audi to bluetooth it (while plugged in) it makes zero difference, its purely where your audio is being sent from your phone- for me the only tiny benefit is when audio is streamed over bluetooth, my speedo displays shows track/call info as it did before. You will not get this over USB, otherwise there's no difference.
In terms of calls, it depends how you "exit" car play. If Im in car play, then change the input to say radio by pressing the button, car play is left open in the background, and therefore my phone still thinks its connected and will be sending audio over Aux- I imagine this will slightly effect calls as you'd need to remember to change from radio to Aux when a call comes in at least.
However when you "exit" car play, properly, your phone knows its no longer over carplay. The bit I dont know is whether when you exit car play, whether it disconnects the phone from sending audio over USB or not. Theoretically your phone will be a normal phone... but still being charged by the USB port... however I'll need to check, but I have a suspision it will still be defaulting audio over USB (so you can still hear your music and nav directions over Aux.. but you'll be controlling your phone manually). So I think you'd need to treat it as all or nothing to avoid confusion, ie phone's plugged in, use car play, dont want to use car play, don't plug your phone in... I will test this for you though.
For absolute clarity as I've mentioned, my car was already heavily equipped before this module, so could stream via BT etc natively already since I have 3G High and had reversing camera etc. Most of what I'm mentioning will not be relevant to a lot of people who don't have this.