Developer Jagex is working on an all-new RuneScape MMO, but they're not ready to call it RuneScape 4 just yet despite using RS4 as a working title. Revealed at the most recent RuneFest, the new game is being built on Unreal Engine and will be set in the world of Gielinor. Well, not for a while it seems as the team is still right at the beginning of development so the game is still a few years out. The team's goal is to build on the best of the technology development they've learned while creating Dragonwilds and apply that to something entirely new.
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TechRaptor