I wouldn't be surprised if they are waiting for all the other manufactures of bitcoin miners to make their announcements first.

It would be kind of funny if Knc was to release a lower nm chip. I heard there are two chip makers that have been able to get the transistors closer together on a single chip die, how close? 14nm. So wouldn't be interesting if Knc turns around says "I know we promised 20nm chips but instead we are using 15nm chips". All those people who got out of their Neptune orders will certainly wish they hadn't.