After a (thankfully brief) wait, Nikons super-speedy J4 mirrorless camera is coming to the US — and its bringing along a low-cost counterpart, the S2. You should see the J4 arrive later this month for $650 with a standard 10-30mm zoom lens, or about $50 more than the outgoing J3. Itll also be available in an $850 kit with a more flexible 10-100mm lens, and a $1,050 bundle is on tap if you want both the 10-30mm glass and a long-range 30-110mm telephoto lens.