Should you decide to swing by the main Android website (which there is very little reason to do), you might notice something odd in the section describing the Nexus 5. It comes in "black, white, red, and yellow." Oh, really now?
There were plenty of rumors about the red Nexus 5 before that one appeared on the Play Store, but this one has been rather under the radar. Presumably it will be about the same sunshine-y yellow as the N5 bumper case.