During Google I/O 2014, Google announced 'Android L' and a Chromecast update which will support 'Screen Mirroring'. This wasn't possible on earlier Android versions without rooting. The updates will be rolling out to users later this fall. However, they released an Android L Developer Preview for Nexus 5 and Nexus 7.
I own a Nexus 5 & Chromecast. I want to try this Screen Mirroring feature. I installed the Android L Developer Preview on my Nexus 5. Is there a beta release for Chromecast too? How can I start Screen Mirroring from my Nexus 5 (without rooting) to my Chromecast?