Yes, TfL are abandoning the scheme where pairs of zones were treated the same. So 1-3 and 1-4 were the same off-peak, as were 1-5 and 1-6. Increases of 0p, 10p, 10p and 20p have separated them all out now. Similar treatment applies to the peak outside zone 1.
Obviously it wouldn’t be palatable to split up all the old £1.50 off-peak fares, but I expect the longer ones to be split further next year.