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I received some information that Nikon prices in Poland will go up by 10% on April 1st, 2009.
Sony is also raising prices in the UK on April 1st by 18% (source).
This banner was on the main page of Jacobsdigital (UK) few days ago.
I did email Herr Michael Gradias (the author of the Nikon D400 book), but did not get a response. A reader actually called him yesterday:
“So, I called him yesterday evening as I promised above. We had a nice talk. When I mentioned the D400 after some time, he laughed. He has a NDA with Nikon, that was clear to me, but his work on the book is real so we may see a D400 in summer.”

Photo Imaging Expo 2009 will take place in Tokyo on March 26-29 and it seems that Canon will be announcing a new DSLR camera on the 25th. The chances that Nikon will be announcing something at the same time are slim, but we can still hope.
Interview with Mr. Nakayama Akira (Marketing Division of Nikon Imaging Company):
Original text / Translated text – the Google translation was bad again. If a you have a better one, please post it in the comments section and I will update this post.
Update – a better translation:
Interview with Mr. Tadashi Nakayama (General Manager, Marketing Division of Nikon Imaging Company):
Nikon D40 successor “under development”
“Nikon will put new DSLRs at a rate similar to previous years”
Video in DSLR: “The direction is right, but Nikon doesn’t have a plan to launch products that have exactly the same function as camcorders, instead, Nikon will launch differentiated products from camcorders by utilizing the merit of large sensor and variety of interchangeable lenses.”
The worldwide market of Digital Still Camera, especially DSLR, will continue to grow.
Nikon is interested in mirror-less system, and Nikon needs to respond to customers’ demand if it exists. As the mirror system of DSLR is an accomplished technology that has some merits superior to EVF, Nikon will inherit it . Nikon has no immediate plan to launch DSLR with EVF, but if Nikon would launch the product ,it will adopt Nikon’s distinct technologies.
I did some more digging on the Nikon D400 book – a simple google search on the ISBN 9783827244826 (click here to run the search) reveals several different website listings. The most interesting one is from the actual publisher Markt+Technik (this was mentioned in the comments few weeks ago, but never reported). The www.mut.de link on the search result page doesn’t go anywhere, but if you click the Cached link, Google will bring you back in time where you can see the same Nikon D400 book on the official publisher’s web site:

I did contact the author Michael Gradias for more info.
Update: another web site with the same listing – can so many websites post a non-existing book?
The same book that appeared on Amazon Germany and on a Swiss online book store few weeks ago (entries are already removed since) is now listed on a Japanese web site, this time the release date is August 2009:

Somebody with a sense of humor was trying to sell this on craiglist in New York yesterday – now the ad is deleted (or maybe someone bought it):

