Jagex is developing a new RuneScape MMO under the working title RS4

Jagex says RS4 is a new RuneScape MMO set in Gielinor’s Sixth Age, beginning in Ashenfall years after the events of Dragonwilds. It is still a few years away and won’t replace RuneScape, Old School RuneScape or Dragonwilds. Jagex plans to involve players in development but says it is too early to share details such as platforms, membership and combat.