You've heard us talk many times of the Project Butter responsiveness added by the Android 4.1 update. It removes the lag that you might have noticed at times on your Samsung Galaxy Stratosphere II. Another main feature is Google Now. With this application, cards are pushed out containing information that is important to you, exactly when you need it. And actionable notifications allows you to make calls, view pictures and video, and respond to emails directly from the notification screen.
source: Verizon (1), (2) via UnwiredView