Today, Apple emailed developers to inform them that all new apps that are submitted to the App Store must support the iPhone X's Super Retina display, starting this April. What this means is that developers of new applications must ensure they accommodate the notch and go edge-to-edge on the 5.8-inch OLED screen. 9to5Mac reports: Apple has not set a deadline for when updates to existing apps must support iPhone X natively. From April, all new apps must also be built against the iOS 11 SDK. In recent years, Apple has enforced rules more aggressively when it comes to supporting the latest devices. Apple informed the news in an email today encouraging adoption of the latest iOS 11 features like Core ML, SiriKit and ARKit. Requiring compilation with the iOS 11 SDK does not necessarily mean the apps must support new features. It ensures that new app developers are using the latest Apple development tools, which helps prevent the App Store as a whole from going stale, and may encourage adoption of cutting edge features. The rules don't mean that much until Apple requires updates to also support iPhone X and the iOS 11 SDK, as updates represent the majority of the App Store. Most developers making new apps already target iPhone X as a top priority.