As with any other Android update release, part of it is company acknowledging which of its products are going to get updated. For now, Sony has volunteered to provide us their lineup of devices being updated.
Sony states that they will update the following phones and tablets to Android 7.0 Nougat: Xperia Z3+, Xperia Z4 Tablet, Xperia Z5, Xperia Z5 Compact, Xperia Z5 Premium, Xperia X, Xperia XA, Xperia XA Ultra and Xperia X Performance.
Nothing was said on when they’ll receive the update but judging from previous years, it takes several months. Unfortunately, the popular Xperia Z3 and Z3 Compact phones will not be supported as the Snapdragon 801 SoC they use is not supported by Android 7.0 Nougat due to compatibility issues with the GPU and Open GL/Vulkan API.