Well look what the Internet turned up. On a Comcast support page, the cable operator is now referencing an Arris XG4 DVR set-top, available in select markets only. The specs on the page don’t advertise it, but multiple sources have told Light Reading that the product is a set-top that supports 4K Ultra HD and High Dynamic Range (HDR) video. And it may be Comcast’s first 4K box on the market.
Comcast Appears to Soft Launch First 4K DVR | Light Reading