I would be very surprised if sound and ANC haven't been improved. Have ordered a pair so will see.
As it’s B&O that doesn’t mention any difference concerning audio quality or ANC, you can be sure that they didn’t touch anything.
By the way, having a H9i myself, I wonder what can be improved regarding AQ... at this price, it’s still one of the best sounding BT headphones around!
We'll have to wait and see - my pair is arriving tomorrow so I'll update here once they arrive and I've tested them. The B&O dealer I phoned to order them said they're supposed to sound "a lot" better but he's not had a chance to try them yet himself.