Yeah!! very strange move from Nikon.
The usual MO is to have the higher end cameras released first(with a particular sensor) and then filter that sensor down through the lineup.
Does this point to something else for the D400(or more accurately D300s replacement)?
Possibly a Sony A800 market level camera .. A cheaper Fx sensored camera, with a tweaked D3s sensor?(unlikely) but it'd have to have some kind of sensor advantage over a D3200 for it to sell in quantities.
EDIT: forgot to explain, that I merged the two parallel threads into one.