I wonder if there any whispers of the upcoming update?
2018-01-19: Update of AOSP Nougat binaries (Android 7.1 – Kernel 4.4) for Xperia X and Xperia X Compact, Xperia XZ Premium, Xperia XZ1 and Xperia XZ1 Compact, Xperia XZ, Xperia XZs and Xperia X Performance. The following updates has been done for all devices: Adreno update, Vulkan update and various improvments; camera AF, AEC, AWB, and AGPS enhancements; configuration is loaded from vendor/etc.