Source code is coming and computers will soon be crunching
Google's Ed Heyl has announced on the Android Building Google group that the source code for Android 4.4 in now available from Google. We'll have two branches — one for the open-source contribution and one for the Nexus 5 itself, per Heyl.
- kitkat-dev for kitkat open source contributions
- kitkat-release the kitkat release build (KRT16M) for the Nexus 5--which will be tagged with android-4.4_r1.
The code is available for download, as well as the factory images and proprietary binaries for the Nexus 5. You can find the images here, and grab the binaries if you're going to do a bit of code crunching yourself right here.
Prepare for the ROMs.
Source: Android Building