Word has come down from the Android-Build group that new source code for Android 4.4 KitKat is on the way, containing a number of bugfixes.
This new build KRT16S. (The original pushed out was KRT16O).
In addition, new factory images — including binaries — are available for the Nexus 4, Nexus 7s and Nexus 10.
No word yet on exactly what's changed, though we did discover a pretty significant audio bug in the Nexus 5. However, the N5 isn't mentioned with this update.
This could, however, help explain the sluggish push of over-the-air updates for the Nexus devices.
Update: We've got a couple OTA links for those who aren't seeing any OTA and want to do some sideloading:
Source: Android-Build group