Apple's upcoming iOS 8 (which you can test out right now) brings a few new features to the Mail app, including some speedy swipe gestures to flag, delete, and mark emails as read or unread.
Another really cool thing they did was add a touch of multitasking, where you can hide an email draft to access and browse other emails. As it is right now in iOS 7, you can only save and close the draft, then hunt for it later. The new feature is incredibly useful for when you need to copy info over from other emails—no more hunting for your "Drafts" folder!
My video above shows this new feature... more