For those Nexus 5 and Nexus 7 users that want to try out the developer version of Andriod L, check out this easy step by step guide. http://www.androidbeat.com/2014/06/install-android-l-developer-preview-nexus5-nexus7/
This process does completely wipe your existing data so make sure everything is backed up before you try.
Install Android L developer preview on Nexus 5 and Nexus 7
Learn how to install Android L developer preview on your Nexus 5 and Nexus 7 (2013, Wi-Fi edition).