When the KNC miners start hitting the market, there will be massive increase.
What was it, 2400 x 3 TH/s?
Have to take that into account.
Not really. It's already factored in when you use a figure like 20-25% per diff retarget.
Look at the numbers - the network hashing rate is currently 58,736 TH/s . KNC's 2400 units X 3 TH/s causes a 12.25 percent increase and KNC will release that in two separate batches almost one month apart. It's not significant enough to warrant extra consideration.