When Google releases a new boot animation for Android the web goes nuts! There is an all new boot animation for Android M that is being ported to some devices. The Note 4 is one of the first devices to receive the port. It comes by way of flashable zip. To install the boot animation you will need to be rooted with custom recovery installed. Installation is simple just download the file, boot into twrp, and flash the zip. Head to the link below for the download. If for some reason you want to return to the stock boot animation there is also a restore zip.
via XDA