Some users are starting to see the newest updates from Apple. Since the next versions of the OSes are due out in a few months, Wednesday's updates are light on features. Here's what's new according to the release notes.
Some of the security updates patch relatively scary- sounding problems. Apple doesn't mention any of the issues that have been exploited in the past, but it's a good idea to get all your devices up to date as soon as possible.
iOS 15.6 could be the beginning of the end for this version of the OS
It is very possible that the last releases before the next version will be the elephant in the room. We could see a few more minor updates to fix bugs, but I don't think we'll see any new point releases in the near future. This could be the last update you ever get for the first-gen SE, 6S, or 6S, because Apple isn't supporting them on the latest version of the operating system.
You can get the software update by going to settings.
If you go to the Apple Menu > System Preferences > Software Update, you can download the latest version of the operating system.
Automatic updates will likely happen with your Apple TV and watch. You can follow Apple's instructions for updating tvOS and watchOS here.
It can take a while for the updates to be made available for everyone, so if you don't see them, just check back in an hour or two.