As promised by Google yesterday during its keynote, the developer preview images of Android L are now available for download for the Nexus 5 and Nexus 7.
The 400MB+ images can be downloaded from here and are meant to be flashed like any other factory image. If you are unsure on how to install the Android L developer preview on your Nexus handset or tablet, follow the steps mentioned here.
The factory image for the 2013 Nexus 7 is only meant for the Wi-Fi variant and cannot be flashed on the 3G/LTE version. So, what are you waiting for? Download the image and start flashing!