I first want to start with a quote from Donald Rumsfeld (thanks for bringing that one up broxibear)
"There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns -- the ones we don't know we don't know."
We went through a lot of speculations in the last few days and I want to do a quick recap:
Known knowns: there will be a new DSLR-related and mirrorless camera announcements from Nikon in September. The DSLR related event should be on or around September 8th. The mirrorless introduction should be at the end of September. Expect four new lenses to be announced with the new mirrorless camera. Note that I said "DSLR related" announcement - there is a low chance that "DSLR-related" means a new accessory or lens only. So far I am aware of only one upcoming DSLR that will probably be at the low end of Nikon's current lineup. There may be even two new DSLR cameras announced in the first week of September.
Known unknowns: no idea when the D700 and D3s replacement will come to life. As I said already, there could be a second DSLR announced in September that I am not aware of. Some rumors indicate that the D700 replacement will have 24MP and new AF system. That's all I have. Any future Nikkor lenses come in this category. No clue what is coming and when. I've mentioned several times in the past that a new 80-400mm lens is very high on the list of potential announcements.
Unknown unknowns: ?