The Apple HomePod is not waterproof. Apple suggests keeping your HomePod away from all sources of liquid. This means you should not store your HomePod in the kitchen near your sink, bathroom, and so on. Do not take your HomePod near swimming pools, spas, and so on.
Apple has released a support document for the cleaning and care of the HomePod. Some customers have been complaining that the smart speaker is leaving a white ring on some wood surfaces, such as oiled or waxed countertops. Apple notes in its document that "it is not unusual for any speaker with a vibration-damping silicone base to leave mild marks when placed on some wooden surfaces. Apple suggests "wiping the surface gently with a soft damp or dry cloth" to remove any rings.
With the news that Apple acquired Shazam last year, HomePod owners are anticipating enhanced music capabilities in the near future. The song identification service continues to add features, such as offline mode for iOS users. In the meantime, Shazam can easily be used on the HomePod in conjunction with Siri, no iOS device required.
Update: Apple has removed AirPlay 2 from the third iOS 11.3 and tvOS betas suggesting it will not be released until iOS 12.0.
AirPlay 2 is Apple's move into multi-room technology and the first big update to AirPlay which was originally introduced in iOS 4. With AirPlay 2 you can send audio from your iOS device or Apple TV to other AirPlay connected devices like a HomePod. To stream audio to your HomePod your iOS device needs to be running iOS 11.3 or later and it must be connected to the same Wi-Fi network.
Open the Home app on your iOS device. If you do not have the Home app installed it can be downloaded from the Apple App Store. In the Home app select the HomePod you want to access, then tap Details. From here you can disable Allow Explicit Content. Now your HomePod will not play songs or albums marked for explicit content.
Only the person who initially set up the HomePod can access the settings on their connected iOS device.