Clearly someone at Apple showed up to work today. The company has pushed out a bunch of updates, including an iOS update. In addition to iOS getting an update, Apple’s also updated Safari and OS X.
Neither the Safari update, nor the Security update provide much information on what exactly is being updated, but that doesn’t mean you shouldn’t head directly to your Software Updater and grab the updates.
Both updates require a reboot, so we’d recommend saving all of your files before pulling the trigger on the patch.