Now, that same phone has become the first phone - besides the Pixel and Nexus devices, of course - to get Android 7.1.1...
Earlier last month, Sony expressed its desire to be the first to unveil the new Android 7.1.1 Nougat OS to its compatible Xperia X series and with the latest move, this dream seems possible.
Sony's Concept for Android is a crowdsourcing program that allows the company to explore new ideas in software innovation and experience, while at the same time maintaining a close dialog with the Xperia community.
According to Xperia Blog, the build number for this update 38.3.A.0.41. If you live in Europe, you can head to the Play Store to grab the Concept Installer for your Xperia X. This specific release requires you to be on the "Experimental" release track. This means that this build is still being tested, so you might encounter some bugs and/or stability issues. The addition of a Restart option was one of the most requested features, Sony claims. Sony has also reportedly added PlayStation 4 PS4 Remote Play with this release. However, keep in mind that the smartphone does not feature DualShock support for the moment. Also, the official changelog mentions the update brings faster camera startup time as well.