"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Shares New HomePod Tutorial Videos on YouTube
Each tutorial video is about a minute in length, and in the description, Apple links relevant support documents, which can be useful for finding additional HomePod documentation.
Apple's YouTube support channel, introduced back in November, is where Apple shares tutorial videos that are designed to provide users with tips on using their iPhones, iPads, Macs, and other devices.
Along with the new HomePod videos, Apple has in the past shared quick tips on features like 3D Touch, iCloud backups, editing videos, sending emails, signing documents, taking screenshots, deleting photos, and more.