Sony Mobile has begun to seed an update for the Xperia X Performance and Xperia XZ that moves the build number from 41.2.A.7.8 to version 41.2.A.7.35. The new update primarily updates the Android security patch to 1 July 2017 (from 1 June previously).
At the time of writing only a few regions (at most) have received the update for each variant, but expect a wider rollout in the coming days. Do let us know if you have updated, and noticed any other changes, in the comments below.
Update: This same firmware build is also rolling to the Xperia XZs and XZs Dual.
DOWNLOAD Xperia XZ and X Performance FTF firmware files – Android 7.1.1 Nougat
Xperia XZ (F8331) 41.2.A.7.35 Nordic Generic
Xperia XZ Dual (F8332) 41.2.A.7.35 India Generic
Xperia X Performance (F8131) 41.2.A.7.35 Latin America Generic
Xperia X Performance Dual (F8132) 41.2.A.7.35 France Generic
Thanks kurakuradisco, Spencer and Stretch!