We caught this information from Butterfly Labs forum user, "Lab_Rat". This user went on a visit to the factory where the units are being burned, boxed and dispatched. According to the unboxing and factory tour posts the device will likely consume 270W while running at the top 60 GH/s (gigahashes per second).
Lab_Rat reports that the ASIC chips used in the Bitforce SC 60 devices are not binned. Binning is the process of classifying chips according to their quality. In his visit he saw "8-10" units being tested, of which only one dropped slightly below the 60 GH/s threshold to 58 GH/s.
As for when production of these units will go fully on-stream, Lab_Rat reported:
Photo credit - ButterFly Labs forum
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