OnePlus One has been rolling out Android 4.4.4 version to the users who have flashed or opted for stock Android device. Until now if you haven’t received the update you can goto Settings > About Phone > Software Updates.
Along with the Android 4.4.4 luxuries, OnePlus One has also received a new features, Clear Image for the camera. According to OnePlus, “Once you switch on the new Clear Image mode in the Camera app, nothing but awesomeness will be captured.” The update has addressed many issues like yellow tinting of the screen is fixed by adding new calibration settings for the display.
Also the issue with the microphone while using “OK Google” command is also fixed via this update.
If you didn’t received the update even after manually checking then you might have to wait for it for few days.