On another casual browse around Amazon, I noticed these two new Nexus 5 2015 cases. Both from BoxWave, they match the renders already out there and the leak from a couple of days back.
The two styles are both for the same handset, and show a slightly thicker than normal profile for a handset of this current generation - hopefully Google is planning on using the extra girth to pile in the battery capacity or some interesting new technologies.
Also there are three cutouts around the back; one for the camera, another for the dual LED flash and laser focussing and the third below for the fingerprint sensor.
Both cases are around a tenner at present. I'll keep an eye out for some more as time passes. Enjoy speculating.