Unreal Engine 4.9
Epic Games' Unreal Engine 4.9 brings free DirectX 12 access to game creators YouTube

Epic Games has finally released an improved version of Unreal Engine 4, the Unreal Engine 4.9, with support for Microsoft's DirectX 12 on leading gaming platforms. This updated version is free to use and enables anyone to create DirectX 12-based games, along the lines of free-to-play Fable Legends for Windows 10 and Xbox One. Avid game developers can also use this engine for creating commercial games at the expense of paying 5% royalty to Epic Games.

Unreal Engine 4.9
Unreal Engine 4.9: Only unlit decals are supported on mobile and web Epic Games/Unreal

Some of the noteworthy features ported into this game engine include the ability to use remote push notifications, support for Apple's CloudKit framework, efficient dynamic shadows, movable lights and decals, enhanced in-app Purchase functionality, and many others as listed below:

Unreal Engine 4.9
Particle processing effects Epic Games/Unreal
Unreal Engine 4.9
full scene particle collision Epic Games/Unreal

Here is what Epic Games says about the new experimental feature of DirectX 12 being incorporated in Unreal Engine 4.9:

The complete list of features supported by Unreal Engine 4.9 is available at Unreal's official website. Discerning gamers may also cherish the new dynamic point lighting system (see animated GIF below) with Unreal Engine 4.9, which reportedly enhances short-lived visual effects such as explosions, projectiles, particle effects and many such post-processing graphical elements.

Unreal Engine 4.9
Unreal Engine 4.9: New dynamic point lighting system Epic Games/Unreal

Up to four dynamic point lights are supported on each object being illuminated, although dynamic shadows cast from point lights are not yet supported on the mobile version, reports iDownloadBlog.