After the leak on Amazon, now a online book seller in Switzerland is ready to sell the same Nikon D400 book (expected July 2009):
A reader actually found the German publisher and they have the book on their website as well:
So, we know the D400 is coming and I will not be surprised if we see it in the next week or so, together with the new Nikon AF-S Nikkor 35mm f/1.8G DX. I am also smelling another lens, maybe FX… Maybe a remake of an existing lens, but I do not have any info on this – just my own speculation. Nikon has to release something in FX, otherwise all the full frame fans will be pissed about the new DX products. If you remember, the Nikon D90 was released before Photokina, so the D400 could be released before PMA, especially since Canon is expected to release new products as well in the next 2 weeks.
Here are some more related rumors I received, all unconfirmed: