Sadly, there's currently no information on what other changes (if any) are included in the update. As is usually the case with OTA roll outs, it might take some time for the update notification to show up on your device, so be patient.
Cheaper smartphone don't get more updates.
I received the update on my XZ1 compact yesterday, and it seems another thing to note is a change in the minimum screen brightness. It can go a little lower than it did before.
So as Tizen. *flips hair*