Just a quick note to anyone waiting for full OS factory images and drivers for existing Nexus devices (outside of the Galaxy Nexus, which bit the dust with KitKat) - as is customary, they will follow over-the-air updates released according to Google's favorite timeline: "in the coming weeks."
The Nexus 5 factory images will be out later today, but don't sit there hitting F5 expecting factory images for the Nexus 4, 7 (new and old), or 10 to pop up any time soon.
As per Ed Heyl, the Google release engineer who replaced JBQ:
In the coming weeks, other Nexus devices (Nexus 4, 7, and 10) will receive their KitKat update, and we'll make those proprietary binaries and factory images available at that time.
Source: Android Building