The XZ2 and XZ2 Compact will be launched much earlier this year than they traditionally have been. Both devices will feature 18:9 "full-screen" FHD+ displays, a Snapdragon 845, and a single rear camera that supports 4K HDR recording.
https://www.notebookcheck.net/Details-of-the-Xperia-XZ2-and-XZ2-Compact-revealed-Devices-to-feature-single-rear-cameras-Snapdragon-845-and-new-18-9-full-screen-displays.285168.0.html