Google recently released the kernel source for Nexus 9 (Volantis) and for the Nexus player (Fugu), just in case you wanted to dev your way through the new devices from Google. If you head out to the Android Open Source Project, you will find exactly what you’re looking for. Non-developer customers don’t fret: even if this is not big news for you, it doesn’t mean this doesn’t work in your favor.
Kernel source files give devs the tools they require in order to develop ROMs and troubleshoot app mismatches on newer devices. Considering Android is open source, this means that every device maker will have to get the source code out and make it available for download sooner or later.
Just in case you want to examine the code for the first Android Lollipop devices out there, you will find Nexus 9 code at android-tegra-flounder-3.10-lollipop-release, and the Nexus Player code will be found at android-x86_64-fugu-3.10-lollipop-release.
Source: Google Groups