I found a workaround solution for the App Store not showing the apps that need updating.
1) Make sure the App Store is completely closed (swipe it off the multitask switcher)
2) Open the App Store and go to the Updates pane.
3) Push the sleep button on your phone -> sleep
4) push the sleep button again to wake it up, then unlock your device
5) The list should show the updates now, as normal. If not, try again from #1.
Worked for me just now. I had 11 updates pending, but they didn't update automatically, and they didn't show in the update list until I did the method I outlined above.