Google had released the Android L as a developer preview for Nexus 5 and Nexus 7. And the test build was really stable, many users have been using it since then on their Nexus devices. But the OS lacked some final finishing and touch up.
And a new video was recently released and posted on Chromium Issue Tracker in which we see a Chromium Crash. It is not that interesting but the new build of the Android L, namely LRW87D, has many new cosmetic changes and interface changes as compared to the previously released developer test build.
As you can see in the image the navigation icons, have been tweaked a bit. And in this build they get a bit smaller, and get further away from each other, obviously to let the user have better control. Also in the status bar the icons have been changed a bit. But most of the changes in the build are not big enough. Android L is set to be released in October, with Nexus 6. you can also have a look at video.