How do I know what update I am getting without installing it?

A

AC Question

Nexus 2012 update to 4.4 issue

I have just noted a 'system update available, click to install' message on my nex 7 2012 android 4.3. I dont think I want kitkat because i have rooted etc my nexus to use OTG and external sd card input. This I do not want to loose.
2 questions.
a. how can i find out what the update is without installing it
b. if I did install would rooting etc remain or need to be redone ( i dont think i could face that again) and can it be reversed
c. (yes thats 3) how can i remove said update to avoid accidental install sometime if its not a good idea for me....yes am old
 
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