Someone nailed it here http://forums.macrumors.com/showthread.php?t=1593355
iOS 7 missed the boat
- The map icon would have a working compass needle.
- The weather icon would reflect the current weather with the temperature.
- The music icon would be the cover of the music playing (when playing)
- Photo icon could be a slideshow…
- the clock app updates so why not the rest?
FIX? Make icons intelligent like you’ve done with the clock. Have it update after 5 seconds of inactivity to save battery