One of the new “big” features of the Nikon D4S was a new mirror balancer and damping mechanism that reduces bounce during high speed bursts, which the D4S can deliver at 11fps. The comparison is pretty telling of the improvement when compared to the D4 operating at 10fps. You should notice that the D4S mirror bounces less between frames and the distance of the bounce is shorter as well.
Bonus fact: This video was filmed in slow motion on the Nikon 1 V2 at 1200 FPS.
In addition to the current instant rebates on standalone Nikon lenses, there are a number of big deals available by purchasing Nikon DSLRs with certain popular lenses.
Included in this deal are the Nikon D600, D7000, D3100, D3200, D5100, D90, D800, D800E and D4. In addition to the several lenses up for grabs, the new Nikon SB-910 and SB-700 speedlights also yield some big bundle savings.
Check out all the DSLR bundle deals here at B&H Photo.