OnePlus One announced Lollipop 5.0 Alpha Build
A great start of the year for OnePlus One user, the official Lollipop 5.0 Alpha build is now available for download. This is just a preview on what OnePlus community is cooking for their users fully customizable ROM. The Alpha build may still have some major issues like Capacitive keys do not turn off when you enable software keys, Clock crashes periodically.
So try it at your own risk if you want to flash the custom rom simply head over to the OnePlus Forum for the full instruction.