Just tested this new feature, it's fine - it works, but 2 questions...
Is there an option to update the promotional images?
And Can I delete a game?
Was wondering the same. I made an update to my game. The layout of the game changed a bit. I used a screenshot of the game for the game pictogram. Now the game pictogram doesn't match the layout of the actual game anymore.
If it isn't possible, maybe it could be made "not possible YET"?