Found this link, should have been confidential, well... http://pages.email.technicolor.com/customers51.html
It will have the same specs as the AirTV from Dish (Technicolor), should look different though.
As seen below :
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To help maximize the availability of this popular service package, AT&T decided to partner with a supplier to provide the highest quality OTT device directly to the end user.
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The Indigo set-top box offers the end user a compact OTT device that combines linear sports content with OTT services such as YouTube and Netflix. It features Android 7.0 “Nougat” software, Dual Band 2x2 802.11ac Wi-Fi, and Bluetooth. We also bundle a Technicolor specified voice remote which also controls TV On/Off and volume.
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Integrated with Android TV, this product is easy for AT&T to customize to their brand and provides the end user with the capability to enjoy the highest quality 4K content. AT&T plans to offer this device with their DIRECTV NOW service launched in November 2016.
As much as I dislike AT&T's services and practices, I'm glad to see this as hopefully it and the use of Android TV STB's by other providers will start triggering more support for the platform down the line.