Cyanogenmod 12.1 update will be based on Android 5.1 Lollipop, and now are sending out the nightly builds to several devices. Although, this versions are not the most stable builts yet.
The CM 12.1 nightly rollout includes builds for several devices which include:
- Google Nexus 7 2013 (LTE)
- OnePlus One
- Motorola Droid Razr
- Droid Razr HD
- HTC One Max
- Nexus 4 (mako
- Google’s current flagship the Nexus 6
With this CM 12.1 you can install the 12.1 build on top of your regular CM 12 installation!
The caveat is this – your Google Apps, will need to be installed manually because of compatibility issues with Android 5.1. The way the nightly build system of CyanogenMod works, nightly builds of CM12.1 ROM will be updated on a day-to-day basis until they put out a final version which will be announced and rolled out to the supported devices.
Remember, do allways a backup of your stuff before install any ROM!