A Nikon Capture NX3 book showed up in a Dutch online book store with a release date of September 1st, 2011 (you can see all related ISBN online entries here).
In the past, we have seen Nikon D800 and Nikon D400 books to show up online. One publisher actually came out and said that their D400 book was a pure speculation. We have discussed this in details before – basically anyone can register a new ISBN number and a book title. The question if this publisher really has some advanced information about Capture NX3 or they are just shooting in the dark. What I find also interesting is the release date of September 1st, 2011 – I already mentioned that Nikon is expecting to have a major product announcement(s) at the end of August.
The last rumor I received was that Nikon Capture NX 3 will be rewritten from scratch and will also include NIK plugins.