Android M 6.0 (Marshmallow) Boot Animation and Wallpapers:See:

Yesterday Google Officially announced Android M's name and its "Marshmallow":

Now the final preview is available to download for Nexus devices like Nexus 5, Nexus 6, Nexus 9 and Nexus Player. You can get the preview from the following link:

Android Marshmallow 6.0 Preview Download

Android M Wallpapers also available to Download:

Also See:

Download all One Plus 2 Stock HD Wallpapers
Posted by Tech Notes on Wednesday, 5 August 2015

Also See:

Download Samsung Galaxy Note 5 Stock Wallpapers (Original)
Posted by Tech Notes on Sunday, 16 August 2015

Android M (Marshmallow 6.0) Bootanimation:

Android Marshmallow boot animation
Android Marshmallow boot animation revealed!
Posted by SlashGear on Monday, 17 August 2015