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.
Upcoming new stuff, officially confirmed
The Coming Storm (Red Cow vol 1) - Ian Cooper (PDF or printed version)
The Eleven Lights (Red Cow vol 2) - Ian Cooper
13th Age in Glorantha rulebook - Rob Heinsoo, Jonathan Tweet, Ash Law and Jeff Richard
Glorantha Sourcebook (via 13th Age Kickstarter, but not system-specific) - Jeff Richard
The Gods' War board game (Kickstarter, release in 2017) - Sandy Petersen
RuneQuest - new Chaosium version, based on RQ2 (Kickstarter second half 2017) - four books (rules, Gloranthan bestiary, GM book, Dragon Pass Campaign book)
Khan of Khans - Gloranthan card game (family game, Prax-based, Kickstarter early 2017) - Reiner Knizia
Nochet guidebook - Harald Smith
Casino Town/Holy Country book
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
Six Ages (computer/mobile game, the successor to King of Dragon Pass) - David Dunham
More speculative
Jeff's novel based on Harmast's Saga
Greg's own Harmast's Saga
Disappeared from the radar/MIA?
Glorantha Bestiary - Pete Nash