There has been a lack of big camera announcements at NAB 2017, with more and more saturation and less camera replacement by TV studios and Filmmakers there is talk of good enough gear already purchased for 4k and 2k/1080p production. The Alexa, RED, Sony F55 and Varicam LT cameras released in the last few years already exceeds most delivery methods in quality and completely obliterates the compressed cable delivery streams for hove TVs.
However manufacturers like Sony & Panasonic have released information about new firmware updates that will improve high frame rate recording on some of their cameras as free updates. This in turn makes for a practical camera line refresh that gives more longevity to the existing hardware while permitting more high speed latitude to current owners.