Android Lollipop is already announced and the AOSP sources made available so it's just a matter of time and even custom ROM teams will be able to upgrade their systems to the latest version of Android,
on the net check out an unofficial Cyanogemod 12 version for Oneplus One.
We can say that it has a lot of custom poco as it is not definitively and is totally based on the AOSP sources of Android 5.0 Lollipop so there are as many bugs as you want but it is excellent for taking a look at the new version of the green robot on our OnePlus One
Therefore the daily use of the ROM is highly discouraged as many users complain of malfunctions to: Bluetooth; NFC; and keyboard.
However if you want to try it just click , promising which brings you back to driving on XDA.
via | Sm @ rty