I understood that existing prices would not change.
I ended all listings yesterday and relisted and initially all showed new scale if fees, but nothing to explain change to buyers.
Later found all new listings had changed back, but at top of listing details given of what buyer sill pay.
Will see what if anything happens today.
The change really only makes a significant difference to very low value items, whether buyers will like it is another matter, as they seem to have lost the will to buy.