The Android L preview is as easy to root as you’d expect, but for those who prefer one-click solutions it hasn’t been happy days. Thankfully Chainfire’s SuperSU app has quickly been updated to bring proper support for Android L. Not only does the app manage superuser access properly, it also has built-in autoroot functionality for the Nexus 5 and Nexus 7 2013.
The upgraded headed out to the Play Store yesterday, but if your installation is client-side you’ll want this flashable update file to apply within recovery. Chainfire isn’t rushing to make any sweeping changes right now considering things could change between now and the final release of Android L, but until that happens this is the holy grail. Let us know how it works out for you (and don’t blame anyone else but yourself if it doesn’t as anything you do to your device is your own responsibility).