If you do own the version of the Samsung Galaxy Tab 2 10.1 wearing AT&T colors, you are going to want to go ahead with this update. First, it brings those three Android 4.1 staples: Project Butter for a zippy and responsive UI, Google Now for information you need when you need it, and the time-saving actionable notifications.
If that was everything contained in the update, you'd be happy. But the changelist includes improved text entry and spell-checking, customizable widgets that change size to fit the screen, a new dictionary for better auto-suggestions, an improved browser with customization features, enhanced email capabilities and better security options.
Time is a wastin'. Go look for that USB cable now and hope that it didn't fall into the cat litter again.
source: Samsung, AT&T via AndroidCentral