We’ve discovered a very handy an undocumented tip today in the iPad simulator which allows developers to take screenshots for their iTunes metadata. Simply follow these steps and you will be good to go.
1) Launch your app and get it running on the simulator.
2) Click edit in the menu bar and while selected, press the option key.
3) Things brings up the ‘copy screen’ toggle. Click that.
4) Now simply paste the screen where you can and save it for upload.