As it usually does with new releases of Android, Google has just posted the source code for the “L” release of Android. The code is viewable on Google’s Android Git repo page for all of the current a previous generation Nexus devices. This includes both the 2012 and 2013 Nexus 7s (WiFi and LTE models), the Nexus 4, Nexus 5, and Nexus 10.
Google has left a few things out of this release of source code, including binary packages and kernel source. This means that developers will not yet be able to build totally stock builds of Android “L” for those devices. This is to be expected, though, as “L” is still a developer preview at this point.