Android M Developer Preview 2 available for Nexus 5, Nexus 6, Nexus 9 and Nexus Player
The list of Known Issues includes the crashing of the Messenger app on the 64-bit emulator, the inability to share a video when using YouTube, and certain problems that are found with the Android For Work Profile Setup.
One more Preview is expected before the final release of Android M is ready to ship this fall. Right now, with not all features up and running, the Preview really should not hold much interest except for developers. If you already have the first Android M Developer Preview loaded on the Nexus 5, Nexus 6, Nexus 9 or the Nexus Player, you can update to Preview 2 by going to Settings > About phone > System updates. Click on "Check For Update."