Hi Bart,
This would be completely speculating at this time. Since we even do not know the specs of the new keyboard, the price is also uncertain. And if you have followed the postings of the last few weeks, you must conclude the prices depend a lot on in what country you buy the KN7000. The price depends on the dealer where you buy the new board, so you just can't tell.
I guess it will cost approximately the same as the KN6000 three years ago. I hope a little bit under the price of the KN6000, but then you just can't tell a this moment.