Cynogen has released its Android 6.0 Marshmallow based CynogenMod 13 nightlies for the Samsung Galaxy Note II and the Galaxy Note 10.1. Both these devices will not get the Android Marshmallow officially so CynogenMod 13 nightlies is the best option for the users of both the devices.
Also Read: Samsung Galaxy S2 Gets Marshmallow via CM13 nightlies ROM
Users will need a custom recovery and an unlocked bootloader to flash the ROMs, which might require some third-party tools in the case of the carrier hardware versions. Remember that these are nightly builds, so even in the case of the normally reliable CyanogenMod, they might have considerable bugs or missing features.If you want more stable version of this ROM than you have to wait for some time.
CynogenMod 13 nightlies now Available for Samsung Galaxy Note II and Galaxy Note 10.1