Think about it. This shipment has been the most disruptive major volume of hashrate unleashed upon the network in a short period of time. You're seeing the effect of that. KnC aren't shipping for another month. Who else is going to have such a marked effect in that time? When they do ship on the following occasion it's unlikely to be equal to what's shipping now, and even if it was it wouldn't have the effect the current outlay will, because the current shipment will already be part of the total network hashrate at that point. They will not be shipping anything like what they are shipping now PLUS what already existed. Therefore the increase will not be as proportional and be more incremental. What you are seeing now will be the largest single increase - proportionately - for a given finite period.