What was that difficult in showing off the phones they are announcing? At that site: http://www.engadget.com/2014/03/31/oneplus-one-cyanogenmod-11s-leak/, the screenshots are finally revealed although the lock screen is looking like Windows Phone-ish and the Android interface as we know today has been simplified with solid selection color on whatever you select. Back then, the Android 3.0 interface was great and the font and glassy stuffs were promising as well as other graphical enhancements.
OnePlus will be out in April 23rd with 1080p display, 5.5MP camera, swappable back cover and 3300mAh battery.