An increasingly familiar name in tech rumor circles has posted on Twitter concerning the 2019 iPhones. This spec-heavy leak asserts that Apple will indeed stick with the screen sizes chosen by the company over the last few years for the 3 devices. It also indicates that the A13 SoC will support Wi-Fi 6, but not 3D Touch.
https://www.notebookcheck.net/iPhone-11-series-will-get-Wi-Fi-6-according-to-the-latest-leak.434102.0.html