It does seem as though the Nexus 5 is right on track with word that it has already received approval from the folks over at the Bluetooth SIG, as there are rumors going around that Google might be looking at an October 15th release date. Should the rumors pan out to be true, it would also mean that the Nexus 5 would be introduced alongside Android 4.4 KitKat, the latest operating system. This particular device had already received FCC approval (or at least, it allegedly did), and having made it past through the Bluetooth Special Interest Group (SIG) would more or less signal the fact that this smartphone is very close to an official rollout.
Ubergizmo , Nexus 5 Gets Bluetooth SIG Approval, Nexus 5 Gets Bluetooth SIG Approval