This is all the available content through the marketplace as of June 4th

Unreal Engine 4.2 required for many of the project files. Each zipped individually for convenience. Pick ones you want to grab inside your client, or nab the whole thing. Extract zip files to your “Unreal Projects” directory and enjoy.

Includes:

Blueprint Office 4.1
Content Examples 4.2
Effects Cave 4.2
Elemental Demo 4.2
Memory Game 4.2
Mobile Temple 4.1
Realistic Rendering 4.2
Reflections Subway 4.1
SciFi Hallway 4.1
Shooter Game 4.2
Stylized 4.1
Tappy Chicken 4.2
Vehicle Game 4.2