A new firmware update has been certified by the PTCRB for the Sony Xperia Z3+ and Xperia Z4 Tablet. The update looks a minor one with build number 28.0.A.7.31, which compares to the current latest build with version number 28.0.A.7.27. We expect Sony is pushing this update to further optimise performance versus heat generation, as well as other bug fixes. We will let you know once it starts rolling.
Thanks Rimaz!