I already mentioned about the Nikon event on February 7th, 2012 but I was not sure what would be announced on that date. It will be the Nikon D800. The camera will have 36MP (not 24MP like reported on several websites). The new Coolpix cameraswill be introduced on February 2nd, 2012.
For all US readers this means the official press release will be around midnight on February 6th and February 1st respectively.
I do not expect any other products to be announced at that point. The two new DX lenses will probably be part of the D400 (or whatever the name will be) introduction later this year (I hear end of March, but this may change).
The Nikon D800 will start shipping few week after the announcement.
There are multiple Nikon events scheduled in various stores across the world where you will be able to experience the new D800.