if there will be no D400 and no 70D-II then the message will be loud and clear : only full frames cameras will have pro specs from now on, no more D300s or 7Ds on DX/APS-C.
however, this is absolutely a non issue if you don't shoot sport or wildlife.
cameras like the D7100 are designed to be crippled about frame speed and frame buffer but for anything else they beat a D300s or a 7D hands down in any department.
so clearly both canon and nikon want to keep DX/APS-C in a position where they don't steal sales from the more expensive full frame models.
fine for me, but it's still marketing BS for most of us, DX is still great value for money, many many famous people still use DX and D300s in particular and make the frontpages of the best magazines and newspapers.
i mean people from Magnum, VII, Panos, Noor ... and their photos make history and will be used in history books, it's laughable so many pixel peepers keep ranting about the idea that 12MP is a joke or DX is for amateurs and bla bla bla.
besides, there's a cost/danger issue, i don't see anybody traveling in poor areas with a couple of new D4s + 6-7 F2.8 lenses but if you lose a couple D300s it's no big deal.
all the Noor guys use Nikon gear, mostly old D300/D300s/D3/D700, the latest pics from Syria by Yuri Kozyrev on TIME magazine were done with a D700 and the list goes on, take a look at the ones winning the World Press Photo awards, they're either canon 5Ds or nikons 12MP, nobody is on D800 or D3x or D4.