I've got a Nexus, but through Sprint. Samsung blames Sprint, and Sprint blames Samsung, but neither has released an update since January. Verizon had updated a similar phone in March. Meanwhile, I've got flaky Bluetooth issues in 4.2.1 which I know are fixed in 4.2.2. (In my case, going into Airplane Mode and then back out means no Bluetooth until I reboot or - sometimes - disable and re-enable Bluetooth again).
Heck with them all; I rooted and put on CyanogenMod and am now good. Not only does Bluetooth hold itself together now, but I've got a few other features and better control of the desktop. Cyanogenmod can even be set to look for recent ROM updates and download when they're ready. One downside is that I've lost "Photo Sphere" panorama on the camera, but I've gained HDR and control over the JPEG compression setting.