Also they have reworked the streaming process, so as to make it more robust to drop outs (essentially by getting the source / speaker to build bigger buffers).
And Airplay 2 is (supposed) to be fully integrated into the Home app, allowing the now playing screen to control multiple speakers etc.
Questions remains over whether multiple AP2 speakers can be used as part of surround sound with a TV.
Also question over degree of control Siri gives you - is it just Apple Music that can be triggered, or will it there be some way to play radio stations?
Anyway, i'm not too bothered - either by voice control, or what AP2 brings over B&O NL.
And as it says on the HomePod page, an Apple Music subscription is required for " full music functionality" - implying that an existing AP speaker updated to AP2 will be missing the odd feature.