This is a totally unofficial list that I put together myself over on the Glorantha G+ group. So details may be wrong but a lot of this has been officially confirmed (e.g. that the product is planned, though not when it will be released).
I thought I'd share it here, for fun and info.
Please note - each section is not in expected release order, unless otherwise specified.
HeroQuest: Glorantha
The Dragonrise, the “offstage” material from The Eleven Lights, for HQG - Ian Cooper
Fonrit setting book for HQG - Ian Cooper
RuneQuest: Roleplaying in Glorantha (RQG)
Upcoming releases in expected order:
The Pegasus Plateau - very short adventures, combats, situations, locations, etc. Intended to be drop-in content for, e.g. "an hour of play after a full session of char-gen," or "need a substantive NPC here, quick," or the like
RuneQuest Starter Set - including Jonstown setting and 14 pre-gens. This is aimed at existing players and not just those new to RQ/Glorantha
GM Sourcebook - including rules for heroquesting, guilds and mass combat
Other upcoming RQ releases:
Cults of Glorantha (aka Gods & Goddesses of Glorantha) - 100 long cult write-ups in two volumes
The Red Book of Magic - every Rune and spirit magic spell of any cult of any size in Genertela
Runequest Campaign Guide - along the lines of the Boy King campaign for Pendragon
Other RQ releases coming later on:
Pavis & Big Rubble - by Robin Laws
Trollpack vol 1 ("troll info and adventures for humans") - Dan McCluskey
Trollpack vol 2 ("everything you need to run troll PCs in a trollish setting with a campaign based around trollish clan life") - Dan McCluskey
Trollpack vol 3 ("covering Dagori Inkarth with a full description of Redstone, and takes the campaign literally from 'tussle over a cave' into creative heroquesting, PC heroes stomping around like a chit in the DP wargame, and climaxes with one of the defining magical events of the Hero Wars") - Dan McCluskey
Elder Races book - 12 races
Barbarian Town campaign pack - by Sarah Newton
Nochet - Harald Smith and others
Seapolis pack
Whitewall campaign pack
Heortland sourcebook
Kralorela sourcebook
Glorantha Quickstart booklet? - 48-page booklet, free PDF
HeroQuest publications
Non-Gloranthan HQ genre packs - Ian Cooper
HeroQuest SRD and "Quest Worlds" OGL core book - Ian Cooper
Other Glorantha publications - rule system TBD
Casino Town/Holy Country book
Dragon Pass - remodelled version of the classic board game, via Kickstarter - Chris Klug
Riders of the Storm: Nomads of the Wastelands (Praxpak) - David Scott
Gloranthan Adventures 3 - Defending the Dark (from D101) - Newt Newport