Update: AT&T has published the changelog for the update (link to complete info):

The software update improves the AT&T branded application launch process, an EAS/Office 365 security pop-up fix,  and an update to all Google branded applications.

Hey, do you still have an original AT&T Galaxy S II? Really? You should probably work on an upgrade. However, on the off chance you haven't already custom-ROM'd the ever-living-Cyanogen out of it, Samsung's rolling out an update for it, as we've heard at XDA, and had confirmed by Samsung's own support website.