There are developer and public betas out for Apple’s upcoming operating systems. You could, right now, put iOS 11 on your iPad or iPhone, macOS High Sierra on your Mac, or tvOS 11 on your Apple TV 4. But you’d be opening Pandora’s box of operating system woes, unleashing unstable, often broken operating systems on your devices. These are works in progress. You wouldn’t climb scaffolding on a building in construction just to see what it’ll look like from the top once it’s completed, would you? Perhaps if you’re a daredevil, seeking out an adrenaline rush, but certainly not if you intend to keep yourself safe. Those who have used iOS 11 on their devices have found it rapidly drains their batteries, often crashes, and that not all apps work with the operating system. This is perfectly normal for software that’s in development. Apple’s beta operating systems won’t truly be “safe” to install until the golden master. Personally, I’m usually willing to take the risk around the time of the 4th public beta, but even then, I’ve frequently come across random issues, like apps not working and crashes. The new operating systems may be tempting, but you must resist.
Now, if you’re an app developer or you have a spare iOS device laying around, then, by all means, check out what Apple’s working on. But do not risk your only or most important device on incomplete software, you will regret it.