Instead of following some strange rumor sites that basically publish every email from whoever it may come, I carefully read what some Pros have to say – in this case the well respected Thom Hogan:
He has posted a well-thought-out Nikon roadmap based on “why trust fan-inspired wish lists when you can just analyze the past and make a solid prediction for the future?”:
Nikon Roadmap by Thom Hogan