Scaleform 4.0 makes it easy to create menus, UI elements, and 2D graphics for modern 3D games. User interface designers can quickly become productive using familiar and mature tools such as Adobe Creative Suite.
AS2/AS3 Compatibility UDK includes Scaleform 4.0 which supports both ActionScript 3 and ActionScript 2.
Multi-threaded Rendering Scaleform 4.0 is integrated into UE3 with a multi-threaded renderer. This provides a substantially improvement in renderer time.