Last I knew, and I'll admit I haven't looked recently, the gigabit was actually limited to something like 480M. The only other one I can think of that is armv7+ (that isnt mx6) with gigabit is the OpenBlocks which has 2 or 4 gigE ports but there is no video on it.
This is the latest update it seems http://boundarydevices.com/i-mx6-ethernet/ but that is decent for a consumer type ARM device (I presume some of the server options do better).