An early morning report on WSJ.com specifies three sizes for this fall's release: 5.4 inches, 6.1 inches and 6.7 inches.
From "Apple Delays Mass Production of 2020 Flagship iPhones":
Apple is pushing back the production ramp-up of its flagship iPhones coming later this year by about a month, according to people familiar with the changes, as the coronavirus pandemic weakens global consumer demand and disrupts manufacturing across Asia, the heart of the consumer electronics supply chain.
Apple is forging ahead with plans to release four new iPhone models later this year, people familiar with its plans say. The phones, some with 5G connectivity, will vary in price and come in three sizes—5.4 inches, two measuring 6.1 inches, and one at 6.7 inches, all featuring organic light-emitting diode, or OLED, screens, the people said...
Apple is slashing the number of handsets that it plans to make in the second half of this year by as much as 20%, one of the people said. It isn’t clear whether the slashed amount for 2020 would be pushed back into 2021 for manufacturing.
My take: This is news? Bloomberg and Nikkei Asian Review have been feeding us 5G iPhone delays stories for more than month.