From my perspective, "dual channel" says everything about how high they are aiming the total platform cost wise. 2011 is expensive, quad channel high TDP mainboards are expensive.
But what possible gain could AMD get from competing against a niche enthusiast platform product?
If ZEN turn's out highly efficient and fast, Intel will just unleash the kraken: drop more cores on a die, sell them for almost 0 profit and obliterate AMD without braking a sweat.
The other way around, 115x teritory, probably where most pc sales come from anyways,
AMD should challenge this market as I do not think that it stands a chance competing against the enthusiast platform no mater how good ZEN may turn out. Right there is: "drop more cores on a die, sell them CPUs for almost 0 profit and obliterate AMD".
Integrate as much as you can on chips, bring total cost of the mainboards down by deploying an efficient uarch that could challenge a cpu like the 6700, ...