I'm running Build 10149 and although a complete redesign isn't necessary there are features I'd like to see (all of these would be optional and placed in Settings for the Lock Screen):
Full music controls-Previous, Play/Pause, Skip, Shuffle, live progress bar (that one is a maybe), artist, and of course song name.
Weather (automatically updates every half an hour and the frequency can be changed in settings...powered by Microsoft's Weather app).
A quick launch button or two. For example, a quick launch for the camera for those people who don't have a physical camera button or lock away the Action Center on the Lock Screen, or a way to launch your favorite app quickly.
The ability to switch the detailed status quickly. You have the default (let's say Messaging) that shows up every time you turn the phone on but then if you click the icons at the bottom of the screen it opens the detailed status for that icon (like Calendar). Then the next time you turn your phone on it shows Messaging again.