I think they are in the review stream
I am fairly sure they have hit the review stream.
AMD had everyone sit on there motherboards till computex, for both the 990fx and the A75's. Days after computex was over they hit the market (atleast newegg had some in stock).
Will be interesting to see how the A series fusions compare to the f-350/f-450. If they will just be a little faster for the value market, or strides ahead.