My concept uses the current UI but makes it more powerful by taking usual actions right from the Notification Center without opening apps.
How it works:
Swiping left on a notification brings up a set of options that would usually have to be done by opening relevant apps and could take 2-3 steps. This works with all notifications. Apps from the App store can take advantage of this too. For example: A Facebook notification can be commented on, liked, or shared right from the Notification Center.