As previously suspected the Nikon D800 price in Norway will be going up according to this banner posted on the Norwegian online store fotovideo.no. Nikon D800 pre-orders placed before April 1st will be eligible for the current price. The D4 was not mentioned, but I believe its price will go up as well.
Curious to read the official statement - another "system error" two months after the camera was officially announced?
At that point I believe there is a very good chance that more countries will get a price increase for the D4 and D800 cameras.
Update: there could be also a D4/D800 price increase in Sweden and Denmark.
Update #2: The Nikon D800 price increase in Norway is over 12%: from 22,185 to 24,990 kr.