Release date: This defaults to today, but you can set it to a date in the future* if you like. When your app gets approved, you’ll want to log back into iTunes Connect and reset the release date to the approval date; that way the app will show up at the top of the new releases section of its category. If you fail to do this, then when your app gets approved it’ll show up buried several pages down – not very desirable.
*if you’re submitting an app UPDATE, however, you shouldn’t touch the release date until you get word that your update has been approved. If you change the release date of an update to sometime in the future, then your CURRENT app will vanish from the app store!
Finally you’ll get to the summary page, where you can review all the info on your app before submitting it for review. Check to be sure everything looks ok, then click Submit.