@Boothy1979, cheers! Well I'll update this thread on any (useful) news I get from my dealer. They said they'd contact me in about two months' time with an update on my order. Though I'm sure the update will be, "...we have no update!".

Appreciate your thoughts on the standard speaker system, that gives reassurance the standard VW speaker package these days is not horrendous.
@SRGTD what VW headunit did you have driving your Dynaudio in your Mk6? Mine had the RNS510 installed and I was actually impressed with the sound from the RNS510/Dynaudio combo. First time I've not tinkered and upgraded car speakers in my car history. I've since updated my headunit in my Mk6 to a Pioneer headunit (wanted wireless Apple CarPlay) and have to say that sounds good via the Dynaudio, well to my ears anyway.
I'd heard mixed things about the Harman Kardon speakers in general. Some BMW owners I know had said the latest HK iterations in the BMW range weren't anything to write home about. Others have said they're top banana. Who knows, guess it's down to your own ears.
I'll probably adopt the "wait until it arrives" before deciding if the standard speakers will remain or will get upgraded. Though any upgrade will involve some "fit my car" custom fit stuff. My days of taking car dashboards and door cards to bits for audio purposes are pretty much over; a younger person's game. Plus modern trim removal appears to be less forgiving these days. So much so that I'm not looking forward to reinstalling my hardwired Blackvue front & rear dashcams from the Mk6 to Mk8. Guess I've got some time to research my cable routing options though.

@Redspear, you may be suprised and have a summer treat. Though I think its best to do as SRGTD suggests and forget about it until nearer the delivery date. That way expectations are less likely to become irritations when dates come and go.