From Unreal Engine’s blog:

Unreal Engine 4.3 includes greatly improved mobile support, awesome new rendering features, improved Blueprint workflows, and strides toward an excellent experience on Mac and laptops. Be sure to check out the new World Composition tools, spline features, and the preview of Paper2D, our 2D toolset! Today we’re also shipping SpeedTree 7 support, our work on Metal API for iOS 8 to date, and new Oculus Rift features such as time warping.

Unreal is one of the most popular engines used by game developers today. With iOS 8 and new devices on the horizon, I can’t wait to see what kind of advancements Metal will bring for mobile graphics.