Nikon hits the important highlights with this replacement for the D3S: improved autofocus, increased durability, better performance, and more-competitive video capabilities.
Updated 1/10/12 with slideshow.
We've been anticipating this one for a while--Nikon Rumors pretty much nailed it down on December 19--but a copy of Réponses Photo surfaced with the story just ahead of Nikon's formal announcement.
According to the magazine, the D4 will replace the D3S; unlike Canon, Nikon doesn't seem to be merging its vertical-gripped pro bodies into a single line. It should also be available before the 1D X, as well as cheaper, supposedly shipping in February for about $6,000. The lower price is unsurprising given the slightly slower burst and less magnified viewfinder, which are the features in a dSLR for which it's increasingly expensive to eke out 1 more frame or a fraction of a multiple. In fact, it reportedly will retain the (quite good) viewfinder from the D3S.
Here are the specs as far as I know them (I will backfill with more details when they become available): updated at time of announce:… Read more