I wonder whether this is going to cause problems for holders of Oyster 60+ passes who need to buy extension tickets when we travel beyond Zone 6? If we touched out with a bank card, we would be wrongly charged.
Indeed. We’ve already seen some reporting suggesting that pay as you go will be the cheapest method, which it isn’t guaranteed to be. The BBC even suggested the whole thing was starting the day of the announcement. I can certainly see lots of problems ahead.