According to the article, authored by Bloomberg's Mariko Yasu and Maki Shiraki, Nikon plans to debut the concept camera by the end of the next fiscal year. With the company's fiscal year running from the start of April through the end of March, this places the expected announcement some time before March 2012.
The article, based on comments made by Nikon president Makoto Kimura, is perhaps a little short on certitude, with qualifiers on all discussion of potential features. Bloomberg says the camera will "probably" offer enhanced video recording capability, and "may" feature a mirrorless design. The company is said to be focusing intensive development efforts on the design, and aims to grow its interchangeable lens camera sales fully 80%, to some 6.65 million units by March 2013.
More details can be found in the Bloomberg article.
Separately, an article from Reuters' Isabel Reynolds reports that Nikon is seeking "wide-ranging ties" with third parties that would offer further ways in which to share and store photographs taken with the company's cameras. The article, also based on comments by Kimura-san, further notes that Nikon has no plans to buy another camera company, but couldn't rule out buying another firm in a complementary field. More details in Reuters' article.