I've read the briefing note sent to hosts. I'd already noticed the price experiment in the UK (although I assumed it was a permanent change). Ideally we would have been informed earlier.
UK consumer travel pricing already required the final nightly price to be shown including all charges and tax from the outset, but the breakdown between what the host's price was and the Airbnb service fees was also clear from the outset.
Now in the UK you have to click 'reserve' before you see the breakdown of host charge and airbnb service fee.
What also seems to be also much less clear - as displayed today in the UK (I realise this is a dynamic experiment) - is the host cancellation policy. That may help some hosts but it isn't any help to consumers who may find that information with fewer clicks elsewhere. I would have thought cancellation policy should be right up front.