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Google Developers
With the rollout of Android now merrily underway, with a large proportion of users seeing the update on their phones and tablets receiving the Over The Air(OTA) update already, but for those who require a complete factory restore, Google has now added the factory images for Android 4.4.2 to their Factory Images page.

The images are available for the Nexus 4, 5, 7(2013) Wi-Fi and HSPA, 7(2013) Wi-Fi and LTE and the Nexus 10. Bringing all Nexus devices compatible with the Kit Kat update, inline at version KOT49H.

The code for Android 4.4.2 has also rolled into AOSP and can be seen over on the Android GoogleSource Github repository

If you need the factory image for your device head over to the Developers page and download your image now, or if you want to build from source, you can now point your scripts at the right place.

Source: Google Factory Images Page, and Android GoogleSource.
Via: AndroidPolice.