The LinkedIn profile of Nathan Richardsson indicates that he is now an Executive Producer on an unannounced project at Jagex. Specifically it states that he is working on: "An unannounced RuneScape Action Role Playing Game...and world domination, of course". So it seems that sooner or later, we'll all be seeing a new ARPG set in the world of RuneScape.
You may remember Nathan Richardsson as one of the movers and shakers of Warhammer 40K: Eternal Crusade from Behaviour Interactive and as the Executive Producer on Defiance with Trion Worlds.
Via WCCFTech