The preview build has been bumped to V81C, is available for the Nexus 5 the second-generation Nexus 7 only. Of course, it’s not suggested to use the builds for anything other than development purposes, as it is still incomplete contains bugs that need to be worked out. Then again, if you’re used to installing nightly builds of custom ROMs, you’ll be right at home. You can download the new builds here if you need a refresher course on how to install the builds, a helpful guide is waiting for you right here.