Bitmain are probably waiting for the Btc price to rise back to $450 before they announce pricing and specs.

Ironic that by mining with the equipment themselves and selling on the majority of coins mined in there super farms they are devaluing the coins. Would probably make more money by having smaller mining operations themselves and selling the stock to the public, as at least most home miners tend to hold onto a percentage of coins mined, which in turn helps to add upward pressure onto the Bitcoin price.