Of course, as with any good, efficent, joined-up roll out of a major new communication...no other part of ba.com has been updated
An F booking for the end of July (i.e. after the hand baggage change comes in) in MMB still shows the old hand baggage allowances, and it links to:
https://www.britishairways.com/trave...club/_gf/en_gb
which doesn't contain details of the changes either.