fyi
campbx has dark pool orders on their exchange. bitfinex has dark pool orders on their exchange and on bitstamp, but only for large (500+ coins) orders.
Yes, but this allows you to place dark pool orders on Mt. Gox, Bitstamp, and BTC-E, and any other exchanges they add support for, regardless of whether or not the underlying exchanges natively support that functionality. This is also for orders of any size, not just for large orders.