This is exciting news for iPhone and iPad users who receives long text messages from other iPhone, iPad, and Mac users. Reddit member AgentGinger149 discovered that the iOS 7 beta seeds allow you to view very long iMessages text messages in full screen mode. There are two screenshots posted at imgur that demonstrate the effect. It you sent or received a long message, tap on it in the timeline to get the option to view it in full screen. This isn't a feature that will effect everyone, but those who use it will no doubt appreciate it. We can't wait for iOS 7.
Check It Out: iOS 7 Lets You Read Long Text Messages Full Screen