[gruez]

Those are average speeds across the country, not best/peak speeds. My guess is that the modem supports more efficient encoding and/or has better signal to noise ratio so given the same radio conditions they can get more bandwidth. Either that, or there's sampling bias where the new phone is more likely to be owned by urban customers, which have better speeds compared to rural customers and thus skewing the average.

[kalleboo]

The phone isn't even out yet, so the only users must be Apple staff. Maybe by now priority reviewers like MKBHD have them?