Created by Cluster Labs, this file for Sketch 3 sounds like a great idea for iOS developers (via Jeremy Olson):

This Sketch file is designed so you make a few changes to the setup page, and over 40 other artboards will be updated with your custom info. Within minutes, you’ll be able to export 45 screenshot images.

I constantly hear that generating screenshots for multiple resolutions and languages for iTunes Connect is a time-consuming process. Sketch to App Store seems to automate several tasks involved with generating App Store screenshots such as device templates, text, resolutions, and, of course, exported files.