Nikon just announced the D7200 DSLR, which will replace the D7100. While the camera is up-numbered, there aren't a whole lot of changes between the two. As far as I can tell, the D7200 has a slightly improved auto-focus system (you won't notice a difference), NFC WiFi (so you can connect to your cell phone), and a time-lapse movie option. Otherwise, the two cameras are the same.
The D7200 will produce the same image quality as the D5500, D5300 and even the D3300. The differences between the cameras are with the "extras" that are mostly unnecessary. It's like the same make and model of car, but different trim levels. The D3300 is the base trim level, the D5300 and the D5500 are nearly identical mid trim levels, and the D7100 and the D7200 are the nearly identical luxury trim levels. You'll have to decide for yourself which trim level you want, but they are all basically the same camera and will accomplish the same thing.