Summary so far, anyway:
BST auto-adjustment: At least one user has had problems; the option to automatically update has disappeared from his system. Awaiting a resolution (Vertigo1 -
original thread).
Low hum coming coming from speakers: Not sure if this was ever just a B&O issue, but it has been fixed with a software update. All PDIs will include any such fixes, but
cars shipped before the start of March might need to go back in if they haven't already been recalled.
MMI lead: Cars usually come shipped with blue collar lead (for older generation iOS devices - doesn't transfer artwork) but will generally be swapped for a red collar lead if you ask. Best to get this done in advance as they don't s
eem to be kept in stock at most dealerships.
Also note that you can get a microUSB variant if you're not an iOS user (I'm on Android and I've requested one) as well as 3.5mm headphone jack, video, and a straight-forward USB socket cable for attaching USB sticks which came as a standard second lead in my car. Part number for the
red collared lead: 4F0051510R (the one for the blue lead is identical except the last letter is P instead - original thread).
Non-smoking pack no-cost downgrade: Removes 2 components - the cigarette lighters and the (rather desirable and completely removable) cup-shaped ashtray. Cigarette lighters are replaced with chrome-rimmed 12V socket plugs (on my S-line, at least - others reported plain black plastic plugs but chrome ones can be ordered later from Stoke Audi Parts for £4.64 each if necessary). The ashtray is not listed to order on that website, but if you can't wangle one from your dealer it can be bought direct from an Audi parts dept for £49.57... For the sake of having something to dump my keys and change into, I know which way round I'd have ordered my car, in hindsight.
Keyless entry (aka Advanced Key): There are a few photos floating around on the interwebs showing a key fob with an LCD display. This is for markets where they include the pre-warm option for cold days. They keyless entry uses the standard key fob (and it's beautiful to use). Some users reported stumbling with locking at first - I've lost the thread but the consensus was just to be calm and gentle when stroking the locking touchpad, and to be aware of where exactly it is. Some have expressed concerns that the key could get separated from the vehicle while the engine was running and the car could effectively be stolen, or at least driven by a friend who finds themself without a key to re-start it at the far end of the journey. In a situation like this, after the driver has removed the key the Stop/Start function refuses to re-start the engine. Even if the genuine owner comes back with the key and behaves as normal, the system asks that the Engine Start button is pressed - pretty reassuring. Can't speak for what happens when the car has been driven around with the Stop/Start feature manually disabled, but I can check and post back if people want. *Edit:* If the Start/Stop has been manually disabled or if your drive wasn't long enough / aircon is running, you can get out with the engine idling and leave the key behind, then get back in and you'll get a very obvious visual and audio warning but the car will still be driveable.
For a video explanation of the Advanced Key, see here.
I'll keep an eye out for more / for updates on these issues.