The iOS lockscreen locks in two different ways. One is by keeping strangers from fiddling around with your iPhone or iPad. The second, though, is to developers: they can’t really do much with the lockscreen except pass notifications to it or make use of the lockscreens built-in music playback controls.
What if developers had full access to the lockscreen, though? What if they could do more than just pass a notification on through? It might look something like this concept.