Sony Xperia XZ1 is top model with 5.2 inch 1080p display will be powered by SD 835.It will be having 4GB RAM and 3000 mAh battery. The Xperia XZ1 Compact will have 4.6 inch 720p display and will be having 2800 mAh battery with 4GB RAM,will be having the same chip as XZ1.
Sony Xperia X1 will be having 5 inch FHD 1080p display, powered by SD 660 chip with 4GB RAM and packs 2800 mAh battery.All of them will have new generation of Camera technology.
Sony is expected to announce all the three devices in IFA Berlin on Sept 1 2017. We have to wait longer for official release.