We welcome the 16-80mm f2.8-4 lens, but at $1,070 it's sadly out of the reach of a lot of advanced amateurs.
The Nikon Coolpix A is a fixed-focal-length lens model with an APS-C sensor along the lines of Fujifilm's popular X100 and X100s.
As long as it stays at a sub-$1,000 price, the Sigma 18-35mm F1.8 DC HSM lens will be a great deal for photographers using APS-C dSLRs.
Nikon has announced a range of new cameras, including the Coolpix A compact camera with APS-C sensor, as well as an "affordable" 80-400mm telephoto lens.
The photo quality you get from the EOS 6D makes it well worth the upgrade over a consumer APS-C model, but between this and comparable or higher-end models it's a less obvious choice.
The company's new APS-C dSLR looks like it has the features and performance specs to pose a significant challenge to Nikon, whose D200/D300 has effectively had the midrange all to itself for years.