On the Comcast Voices blog site today:
Introducing the Industry's Fastest Wireless Gateway
By Eric Schaefer, Senior VP, Wireless Product Management, Comcast Voices - September 8, 2014
http://corporate.comcast.com/comcast-voices/introducing-the-industrys-fastest-wireless-gateway
The Technology Behind the Industrys Fastest Wireless Gateway
By Jill Formichella, Dir. of Home Network Product Development, Comcast Voices - September 8, 2014
http://corporate.comcast.com/comcast-voices/the-technology-behind-the-industrys-fastest-wireless-gateway
quote:Comcasts new Xfinity Wireless Gateway, the DPC3941T, features the latest industry technology to provide superior performance and make it the fastest on the market. The DCP3941T features cutting edge 802.11ac Wi-Fi technology, a high power 3x3 MIMO design with 3 spatial streams that can provide up to 1.3 Gbps of raw throughput, 80 MHz wide Wi-Fi channel support, and 256-QAM modulation.
 
Also see:
Comcast Rolls Out Speedier Wireless Gateway
Cisco-Made Device Sports 802.11ac, MoCA 2.0
By Jeff Baumgartner, Multichannel News - September 8, 2014
http://www.multichannel.com/news/technology/comcast-rolls-out-speedier-wireless-gateway/383631
EDIT: BTW - Here's a guide I found for it:
Wireless Network Connection and Troubleshooting Tips
Wireless Gateway 2/XB3 (Models DPC3939, DPC3941T, TC8717C)
ENG_WG2XB3_0714.indd - 6/17/14
http://media2.comcast.net/anon.comcastonline2/support/help/faqs/wireless_gateway/Wireless_Gateway_2_Troubleshooting_Guide_ENG_WG2XB3_0714.pdf
EDIT2: Karl now has a news item up about it: http://www.dslreports.com/shownews/Comcast-Unveils-New-Industrys-Fastest-Wireless-Gateway-130399
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