Although the autoloader files for both the BlackBerry KEY2 and BlackBerry KEY2 LE have been available in the CrackBerry Forums for a few days now, those who prefer their updates to come through the official over-the-air process are now starting to see the ACE748 update rollout.
As with most security updates, the download on this one is small coming in at around 66MB. Once downloaded, the install process will only take a few minutes and once booted up, you'll see you have the October security patches installed.
As always, the update does depend on the variant of KEY2 you have, you can check here to see if your PRD is included yet. Outside of that, go ahead and get yourself updated. If you're a KEY2 LE owner, it'also worth checking as I'm sure that update is coming too.