Following the launch of the Xperia 1, Xperia 10, and Xperia 10 Plus a few weeks ago, Japanese OEM Sony is set to unveil yet another device. The device, said to be the Xperia 4, will be a compact sub-premium phone featuring a Snapdragon 710, dual rear cameras, and Sony's new 21:9 display.
https://www.notebookcheck.net/New-Sony-compact-phone-in-the-pipes-Xperia-4-Snapdragon-710-21-9-display-2800-mAh-no-jack.413948.0.html