Software Update just kidding?

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http://forums.androidcentral.com – I set my phone down for an hour, when I checked it just 5 minutes ago I noticed a notification icon I didn't recognize. I pulled down the notification bar and it says I have a software update. I'm excited, so I tap it only for it to check for updates and then tell me my software is up to date. Like, what the hell right? Software update thinks it's funny. Either way, has anyone received an update that worked? Or an update that didn't work like my situation. I hear Sony is releasing Jelly Bean early. Some reports say Q1 2013 and another said February. I was hoping to have it maybe a few days (HowTos)