I do realize the consequences for Nikon if the leaked roadmap is real. I just want to emphasize on the fact that the leak came from the Czech forum grafika.cz (here is the exact translated link again). NikonRumors and many other sites consecutively picked on that news. The post in question came from an unregistered user named NikonRumor (that's not me) with an IP address of 205.212.73 .--- A quick IP address geolocation search shows that the comment was posted from Englewood, Colorado and the IP is owned by a company called NTT America Inc. (www.nttamerica.com). NTT America is a subsidiary of NTT Communications, the international and long distance arm of Nippon Telegraph and Telephone Corporation (Japan).
I cannot link the Colorado IP address of a Japanese company with the Czech forum and the potential leak from Nikon UK, but I do know for a fact that Nikon does use a third party IT company in the UK. Of course this could all be a hoax from somebody with a lot of free time on their hands. I do not know and I do not have any other information on that topic besides what was already posted on the Czech forum. If Nikon Corp. would like to make an official statement on this rumors, here is my contact form.