Looks like Sony is aiming to provide quicker android updates to its devices especially the Xperia X series. As per the official confirmation, Sony is pushing Android v7.0 Nougat updates to Xperia X and X Compact phone. Its build number is 34.2.A.0.266.
Android Nougat Updates by Sony is here
Sony has taken a lead compared to other players like Samsung, who are still testing Nougat on devices. Most of the other companies are aiming early 2017 for pushing Nougat updates.