PetaPixel reports: [edited]
The My Passport Wireless drives include an SD card slot so you can unload photos on location without having to get an intermediary device involved.
When you’ve filled up your camera's SD card, back it up by sliding it into the included slot. The photos can then be viewed and downloaded onto any of the connected devices wirelessly.
It will allow you to wirelessly connect up to 8 devices to it without any need for an Internet connection, and can act as a WiFi hub/hotspot.
It runs off of a rechargeable battery that will last for up to 6 hours of video streaming and 20 hours of standby time.
Price: 1TB - $180, 2TB - $220.