The official Nikon announcement will be in two weeks (August 24th) and there is still no convincing information (specs, pictures, model name) of what exactly will be presented. The consensus from several different sources points to a Nikon D3s and D700 replacement, but I am really starting to question this scenario. Maybe there are no leaks because there will be no new DSLRs on August 24th. The only reliable info on new products so far has been the leaked Nikon mirrorless mount, the upcoming Coolpix P7100 and P1200pj models, plus a new rugged compact camera with built-in GPS capabilities and maybe we will see just that: new Coolpixes plus the mirrorless solution.
It will be interesting to see if Nikon will announce the new Coolpix cameras next week (around August 17th). That will guarantee a major new product introduction on August 24th, since point and shoot cameras are never announced together with pro level equipment. If there are no new Coolpix cameras next week, don't hold your breath for August 24th, unless Nikon makes another announcement in early September.