Found this:
https://www.dynaudio.com/dynaudio-academy/2017/february/dynaudio-launches-updated-focus-xd-at-ise
"The 2017 range has had a ground-up revamp of its signal-processing flow (incorporating elements from Dynaudio’s professional LYD range of studio monitors) for substantial improvements in sound quality. Redesigned, re-tuned and more efficient crossovers behave more like digital versions of passive speakers. That simpler internal processing means an even more transparent, even more authentic sound."
So that sounds more substantial than firmware updates...not sure if discounted 200 XD's are worth the savings
https://www.dynaudio.com/dynaudio-academy/2017/february/dynaudio-launches-updated-focus-xd-at-ise
"The 2017 range has had a ground-up revamp of its signal-processing flow (incorporating elements from Dynaudio’s professional LYD range of studio monitors) for substantial improvements in sound quality. Redesigned, re-tuned and more efficient crossovers behave more like digital versions of passive speakers. That simpler internal processing means an even more transparent, even more authentic sound."
So that sounds more substantial than firmware updates...not sure if discounted 200 XD's are worth the savings