Finally…
Details here. Was there a press release? I’ve been googling every day to find it:
https://tfl.gov.uk/campaign/new-fares
Now to decide whether to get a travel card or PAYG… Downside of PAYG is that my credit card hates it, and constantly declines suspicious duplicate TfL pending holds and daily cap transactions… which leads to regular double-charging as TfL claws back unpaid fares