Google Developers
What’s a release of Android without code…lots of code? It’s currently being pushed to the Android GoogleSource repository right now. Under the branch android-5.0_r1 the code is being released as LRX21M and the push is ongoing. There’s a lot of code, but you can find the main branch right here :

Devices wise, the source is being pushed as well and we can expect Images and Binaries to crop up on the Factory Images page shortly. As far as devices are concerned, the new kid on the block is of course the Nexus 6 and Nexus 9. There’s also Android TV and Asus Fugu – better known as the Nexus Player.

The code is still being pushed but you can find all the branches for the devices here :

Source: Android Google Source.
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    full source got pushed. repo init -u -b android-5.0.0_r2 then repo sync 🙂

    loooking through the changes now.

    geoff fieldew

    It seems Google have the code ready to push out all the factory images for compatible Nexus devices. That would be amazing! But me and my LTE Nexus 7 (which only just got 4.4.4) are being cautiously optimistic.