The Nikon B700 enters the competitive super zoom category with 4K video and a 60x optical zoom lens.
While the name is quite different, the B700 appears to be an update to the Nikon P610, offering the same lens. The B700, however, adds 4K video at 30 fps for highly-detailed footage. Bluetooth is also included, which works similar to wi-fi only takes up less power, so you can stay constantly connected and enable automatic backups and transfers. But, the B700 does drop the speed from 7 fps to 5 fps, and that's limited to only one second of shooting at a time.
While not the big 83x zoom of the P900, the Nikon B700 offers a 60x zoom range, paired with a 1 cm. macro mode for a good range of versatility. The lens has just an average aperture though--there's a handful of cameras that offer brighter lenses that perform better in low light. Still, the 60x optical zoom is a pretty nice feature to have and it's paired with a five-axis stabilization system. The 1/2.3" sensor is average sized, but it's also backlit, which helps low light performance.
Unlike the cheaper B500, the Nikon B700 is a bit more complex, offering manual modes in a body that feels more like a DSLR. Even RAW shooting is included, which is difficult to find in this category.
The Nikon B700 offers 4K video and a big 60x zoom, a welcome combination. But, the B700 isn't alone with this feature set. The Panasonic FZ300 offers 4K video and a much brighter f/2.8 lens that will perform better in limited light--the trade-off is a shorter 24x zoom. The Panasonic FZ1000 offers a higher resolution, brighter lens and 4K video, though an even shorter zoom at 16x and at a higher price point. If you are looking for a big zoom camera with 4K capability and can't spend more than $500, the Nikon B700 is a good, though not perfect, choice.