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I expect Sony to provide application eco mode, cpu control in 4.3 update
This is very useful in extending the battery when the phone is not in use
such as Lenovo and LG are wearing these features are embedded
perhaps others as well as I hoped
You can root to get that,I do not think sony will implement that in their near future phones.
@him, that is not in Android's changelog but if Sony wishes it can include some features which can be beneficial for customers but then what about their flagship devices 
@TJ I'm talking about Sony's android 4.3 changelog. 4.3 for Xperia z series doesn't include any of this. I don't think Sony will be adding those features anytime soon. Sony is yet to provide app 2 sd feature so expecting something like that from Sony is like daydreaming 
haha means I can only hope
though it features very good
I do not want to take risks with root
Yes,I am sorry.