The RMA'ed Neptune was replaced with a different unit. The unit has a few cores that are not functioning properly, but because the total hashing power is at least 3 THS, KnC will do nothing.

KnC is not willing to offer any compensation of any kind for the downtime, but if you are asking about the second Neptune, it will not be shipped until the end of Batch 3 and Batch 2 (when I checked yesterday,) hasn't started shipping yet.