Sony continues to push Android Nougat out to their various phones and the Sony Xperia X and Xperia X Compact are the two latest device to get updated. These two devices are now getting updated to Android Nougat 7.1.1 as part of firmware build 34.3.A.0.194. The update also brings the May 2017 Android Security Update to these two mid-range phones.
If you have the unlocked variant of these phones, which here in the US is likely the case, you can expect the update to hit your device over the next few days. You can always manually check by going to Settings>About Phone>System Updates. Overall it is a small update as it is an incremental one over the Android Nougat 7.0 build that came earlier this year. In the case of my Xperia X Compact, it was under 500MB.