In the iTunes Connect App Management interface -- how do I edit the screenshots for my localized (approved and live) iPhone app?
Unfortunately, the web upload form had a bug which actually required the screenshots to be provided in reverse order (I provided them in the correct order, which meant that Apple reversed them and now they ended up wrong). Also mentioned here at StackOverflow. I only managed to edit the 4 screenshots in the US version, but not my localized version, and that was in the old interface.
The current standing on this has changed to:
Beginning January 9 [2013], app screenshots will be locked in iTunes Connect once your app has been approved. New screenshots may be uploaded when you submit a binary for an update to an existing app or a new app.