A little late to the bulk of the conversation and perhaps this belongs elsewhere, but...
The thing that annoys me about Software Updates Available notifications is that I don't know what's getting updated. All it provides is the option to Install or Later - with preset times. How about giving some indication as to what is getting updated, so I can decide whether or not I want it to update it then or later? (Yes, I realize I can go look in the App Store, but that defeats the purpose of the notification, IMO.)
If it's an app I use frequently and it appears to be an important update, I may decide to take the time to update it then and there.
If it's a game or something I rarely use like a digital camera RAW compatibility update, I'd probably say later.
If it's a large update and I need all the bandwidth I can get at the time, I may want to postpone the update.
BTW, if I get a notification that there's software to be updated, has the update already been downloaded, or is it waiting for me to tell it to update? Dumb question perhaps, but I'm not sure I've noticed which is the case.