Earlier today, Dickson tweeted:
iOS 10.3 to feature a new Theatre mode - will include a new popcorn-shaped Control Center icon.
iOS 10.3 beta 1 is scheduled to seed on January 10th.
It's unclear what exactly this Theater mode entails but we'll let know as soon as we hear more! Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.