Yup, that looks like a Nexus; nope, we don't know anything more than we did yesterday
Details on the expected upcoming Nexus phone are sparse, but we now have another look at a picture of the back of a purported "LG Nexus 5." The above image, which came from a poster on MacRumors forums (of all places), is apparently of an upcoming device that looks very similar to previous leaked information from the FCC and a brief hands-on video.
This is another solid and somewhat clear view of the back plate, albeit partially obstructed by another device at the bottom (likely to cover up any identifying information), that shows off the vertical "Nexus" logo and large camera pod in the top left corner. The back seems to be of a similar (or same) material as what we've seen before, but giving the lighting we can't be sure.