Found this article from March about a new D&D open world game.
Open-World Third-Person Dungeons and Dragons RPG In Development - IGN
Open-World Third-Person Dungeons and Dragons RPG In Development - IGN
Hidden Path Entertainment, the studio that worked with Valve to develop Counter-Strike: Global Offensive, is working on a "AAA, third-person, open-world fantasy RPG that will be taking place inside the Dungeons & Dragons franchise."
Hidden Path shared the news on Twitter by calling out for potential Graphics Programmers, Lead Graphics Programmers, Senior Technical Artists, and Writers to apply to join the team and work on this project.
By looking at the job descriptions, it appears as though this Dungeons & Dragons project will be built in Unreal Engine 4. Hidden Path is also looking for those experienced in console technology (hinting at a release beyond PC), a writer who has narrative branching skills and experience with ensemble casts, and more.