The ‘ground-breakingness’ of these aircraft is really rather irrelevant from a passenger’s point of view – unless or until (in the case of the 787) it really breaks. Most of the big design changes are for the airlines and their accountants, not so much for the pax. With airlines choosing a nine-abreast economy configuration for their 787s, on an aircraft with pretty much the same cabin width as a 767, it’s going to be more of a back-breaking experience for everyone packed inside.
Arriving today, BA’s brand-new 787s have a shocking seven-seat CW layout compared to QR’s four-abreast. That’s pretty ground-breaking, but not in a good way.