If KnC delivers +400 units per day as they claim we will probably see a 400% difficulty jump. Anyhow, i dont think they will.
If KnC delivers 400 units a day, assuming all Jupiters at 500Gh/s...
200Th added daily for the 12 working days between the beginning of next week Monday and October 15. That's 2.4Ph dropped onto the network by the middle of October. (Coincidentally, that figure being very close to D&T's thread on guesstimated preorders)
This would mean a jump of ~350million (from 2.4Ph) + ~150 million that it is now = 500 million. High? Maybe; A 400% increase? No.
Yep, you are right, that'd be a jump of above 200%, not 400%. Anyhow, a 200% jump from 150M might too be quite a problem for some people.