Walter, if you are correct in saying the 50Gbs "packaged and evaluated" devices are now being sent out to potential partners and customers, then I would say, yes, they must already be meeting some minimum requirements "as is", and the additional engineering work will then be focused on improving those results
I still hang on the words "packaged and evaluated", to me this does have a ring of completeness, and if it is the case that these devices are now being sent to potential partners and customers, wow, things may develop rapidly going forward!
#DemonstrationPhase