Preview at WWDC likely in June, followed by September launch.
Hands-On: OWC's 'DEC' Adds an SD Card Slot, Ethernet, and USB Type-A Ports to the MacBook Pro
This is the DEC from Other World Computing. It's a new dock for the 2016 MacBook Pro that's designed to return some of the missing features Apple removed. It's unique in the way that it connects to the computer and the functionality it brings.
The DEC attaches to the bottom of the MacBook Pro by replacing the screws that hold on the bottom plate. This method won't void your warranty, but it will allow for the dock to be securely attached at all times.
At first glance the DEC looks comically large, but in person the size and weight are more than manageable. OWC claims that when attached to a 2016 MacBook Pro, the DEC will be as thin as the 2012 MacBook Pro. Weight didn't seem to be an issue, but this is an unfinished prototype that doesn't have all the hardware in place.
When considering the functionality of the dock, the size and weight compromises may be worth it. The DEC connects to the MacBook Pro over Thunderbolt 3 and will bring USB Type-A ports, Gigabit Ethernet, an SD Card Slot, and up to 4TB of storage. Additional features are also being considered, such as an expanded battery pack.
The models shown here are still in prototype phase, but OWC assured us the final models will be available within months. The DEC will come in both Silver and Space Gray, and at release it will be available for the 15-inch MacBook Pro. Pricing is not yet available, but OWC expects it to be priced lower than the BTO 2TB storage upgrade available from Apple.