Android 6.0 Marshmallow launched with an updated Material Design UI, along with lots of new features and APIs such as native biometric scanner support, even longer battery life, app permissions and many more stuff. We already got the Full Stock Wallpapers package of Android Marshmallow available for download.
The latest Marshmallow Developer Preview also packs a NEW cool Boot Animation (see the GIF below). You can get this booting animation on your Android smartphone right now.
The boot animation has been pulled from the dev preview ROM of Android Marshmallow and has been made into an .APK. If you wish to install it on your phone, you need to have an AOSP ROM (CyanogenMod, ParanoidAndroid, etc.) or any ROM with CM Theme Engine Support. Download the APK from the source link below. Enjoy!