"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Official Apple Watch Charging Dock Packaging Shown in Leaked Photo
Circular in shape, the dock appears to support the Apple Watch in two orientations, both laid flat over the top in portrait mode and on its side in landscape mode, useful for Nightstand mode. The charging puck within the dock seems to adjust from flat to upright to accommodate both orientations.
The Magnetic Charging Dock is said to come with a Lightning cable that will be used to charge the Apple Watch through the dock, but it does not include a USB power adapter. The packaging for the dock lists a price of €89, which likely means it will be priced at $79 in the United States.
At $79, the Magnetic Charging Dock is significantly more expensive than Apple's dock for the iPhone, but it appears to have a more complicated design with the ability to support both portrait and landscape charging. It is not known when the dock might go on sale, but the completed packaging signals an imminent release date.
Update: German site Grobgebloggt.de (via Apfelpage.de) has shared photos of the Magnetic Apple Watch dock. It ships with a 2M Lightning cable.