Okay. So what is new in this Sony Bravia update I just got?

stackstackstack

http://www.sony.com.au/support/download/618489/product/kd-65x7500d

Seems you've received Android 7.0

This software update (version PKG6.2508.0051PAA) provide the following benefits and improvements:

Upgrade to Android Nougat
For details, please visit http://www.sony.net/androidtv-updateTN/
Picture-in-picture during using an app
Task-switching
Expanded support for Hybrid Log-Gamma HDR content
Using voice search with the browser (*Internet connection is required.)
Voice search for Serial AbTak (Only in India)
Improved the Settings screen
Add multiple Google accounts to your TV
Improves general performance of the TV

Phlerg

Looks like security fixes, judging by "security update."

webby619

I still have Android 6.0.1 after the update.

The body of your text says 7.0? And I got May 1 2017 security update.