OnePlus has been constantly dishing out teasers for its upcoming One smartphone since December, but little is known about its UI until we received these two screenshots today, courtesy of a reliable tipster. First of all, this Android KitKat-based OS is dubbed "CyanogenMod 11S," and given how the lock screen on the left looks nothing like the one in the original CyanogenMod, we assume the "S" indicates that this flavor carries OnePlus' customizations. This cleaner lock screen lacks the usual unlock slider, but it still shows the clock, date, weather, battery level and text messages over a solid-color background. Here's hoping that we can also toggle specific apps from the lock screen using swipe gestures.The screenshot on the right confirms the presence of the three virtual Android buttons (as opposed to hardware ones), and that this Android 4.4.2-based OS is made for a device named "One." With 23 more days to go until the phone's launch, we'll be keeping an eye out for the OnePlus One's few remaining secrets -- especially its sub-$400 price tag, which is very competitive for this 5.5-inch 1080p, Snapdragon 801-powered device.