Android enthusiats has brought official support for Cyanogenmod on the T-Mobile and Sprint variants of the Galaxy Note 4. This clearly shows the love-hate relationship of Samsung android phones and its users. You can download CyanogenMod for Sprint and T-Mobile Note 4 from links given below. Both are using the latset CM12 framework which implies they are based on Android 5.0 lollipop.
Do not expect them to be completely bug free though as they are all nightlies and bugs are to be expected. Right now only Tmobile and Sprint variants are supported as AT&T and Verizon have locked down their devices to a greater degree.
On any other Samsung, I would jump at the chance to install CM12. The Note 4 though? Sadly, I think I’d miss all those TouchWiz features that make this big screen truly useful: S-Pen, Multi-Window, Popup Window, etc. Maybe Google will work in some phablet features in the next big Android release.