Watch a talk on open-world and landscape tools in Unreal Engine.
This presentation by Epic Principal Technical Artist Ryan Brucks will tell you about the current state of Open-World Development in UE4. The artist shared the team's progress and discussed future plans.
The future holds a bunch of new features for open-world projects including Landscape Layer System, Virtual Texturing, and Custom Blueprint Brushes.
Basically the team wants to help artists save time, providing them with powerful tools for creativity and efficiency. Make sure to discuss the talk in the comments.