I wondered whether Chaosium might entertain a new printing of the Guide to Glortantha updated with some of the wonderful new art we've seen from the RuneQuest line, and other new products such as the Gloranthan sourcebook? There's some cool images in the Guide to Glorantha for sure, but I feel with the new art in products such as RuneQuest, there's an even stronger presentation & feel and for the setting.
I imagine that many Gloranthan fans have already bought their hardcopies, but perhaps some may be persuaded to look again with a new presentation, and maybe new Gloranthan fans maybe persuaded to invest with an even richer presentation? The new Chaosium books have been so well done, and I think it would pay (at least artistically) to revisit the guide at some point with the library of new artwork now at hand.