Android Marshmallow was officially named yesterday, along with the unveiling of the new mascot over at Google HQ. We are still a way away from getting to play with the final version of the new OS, but we can all enjoy new boot animation (above) until then.
The animation was pulled from the latest developer preview build for Android Marshmallow, which is available for a number of Nexus devices.
Although there is still a long wait until Marshmallow for many of us, some Android users can enjoy the boot animation early, as it is also available as a download-able APK, see the source link. Although, you will need to be running a ROM with CM Theme Engine support to make use of it. Just install the file and pick it from the boot animation tab.
Source : XDA
Also See: [Download] [4K] Stock Android 6.0 Marshmallow Wallpapers
GIF Download Link: http://i.imgur.com/SfqlMsn.gif