Android L was announced yesterday at Google I/O without a code name and without a version number. What was announced was a developer preview to be released the following day, which is today! The downloads are now available here. The downside is, you must have a developer device meaning you must have a Nexus 5 (hammerhead) or the Nexus 7 WiFi (razor). There is not a developer preview for the Nexus 4 or any other Nexus device.
This is a developer preview, so bugs are expected. Remember, ART is now full time and the only runtime on Android L. Dalvik is no longer an option, and some apps still do not work on ART. If you are okay with a few bugs and are determined to have bleeding edge technology, head on over to http://developer.android.com/preview/setup-sdk.html and download the system image now! Instructions to install the preview are available here.
An in-depth look at Android L will be coming in a few days after I have had some time to test it out on my Nexus 7 for those of you who do not have either Nexus device.