Developer Roymam is currently working on a widget that will display notifications on the lockscreen in Android 4.2. The app may also work with widget locker on Android 4.0.4. The widget will be able to handle all dismissible notifications including those from sms, facebook, missed calls, gmail and more! The app is not ready to be published to the Google Play Store quite yet. However you can go and grab a beta copy at the source link below. It should be noted that this will only work for devices using Android 4.2.