https://techcrunch.com/2019/04/09/apple-could-release-a-31-6-inch-6k-external-display-this-year/

Analyst Ming-Chi Kuo has released a new report about future Apple products — 9to5mac obtained the report. The company could be working on a new 31.6-inch external display with a 6K resolution that could work particularly well with the Mac Pro. New iPad and MacBook Pro models with better displays are also in the works.

Apple used to sell external displays but stopped selling the latest model in 2016. The 27-inch Apple Thunderbolt Display had an aluminum case and an LED-backlit LCD display. It had four times less pixels than the 27-inch 5K iMac with a resolution of 2560×1440 pixels. And it never made the switch to Thunderbolt 3.