Well, on on April 05, 2017, Jeff wrote in https://www.chaosium.com/blog/designing-the-new-runequest-part-13/ RuneQuest Gamemaster Book: This includes lots of GM-oriented rules (battle, magic items, etc.), materials on running games for RQ set in Glorantha, plus fully statted-up and
described encounters that will enable sandbox play in Dragon Pass.
Not sure if it is still valid but is is a start :-) !