The latest information indicates that Nikon will announce only their mirrorless camera on August 24th (in addition to the new Coolpix cameras). This makes sense since the mirrorless mount pictured above was the only real leak in the past few weeks. I don’t have the technical specs yet, but here are some more details on the upcoming interchangeable lens camera from Nikon:
See mockups of the camera here.
It seems that another press event is already scheduled for September. There are already some “new product launching seminars” planned the end of September in at least one country. I do not have an exact date, but I think September 19-23 would be a good guess.