Full announcement, for those who have difficulty with links (eg, due to mobile devices):
40,000: Armageddon is Leaving Steam
Greetings, Commanders,
We want to inform you that the Warhammer 40,000: Armageddon franchise will soon be removed from Steam. Starting May 19th, the game and its DLCs will no longer be available for purchase on this platform.
However, this is not the end of the battle! Sanctus Reach will remain available on GOG.com, where you can continue to purchase and enjoy the full franchise DRM-free.
If you've already purchased the game on Steam, don't worry — it will remain in your library, and you'll still be able to download and play it as usual.
Thank you for your continued support
Despite the phrasing, Sanctus Reach on GOG does not include any Armageddon content. Armageddon is however still currently listed on GOG, with a normal (ie, not near as good as Steam's) sale price, so it's possible the announcement was incorrectly phrased, and meant to indicate that Armageddon isn't being pulled from GOG, just Steam.
The phrasing (eg, "will still remain") does heavily suggest this is likely the case. Unfortunately, as the announcement only just dropped, I can't find any further information anywhere yet (ie, to either support or discourage that assumption). As the Steam offer/delisting has until the 19th, I'd give it a day or two (for those who don't want it on Steam specifically) to see if things clarify.
Edit: Confirmed, now:
We want to inform you that the Warhammer 40,000: Sanctus Reach and Warhammer 40,000: Armageddon franchises will soon be removed from Steam and our website. Starting May 19th, the games and their DLCs will no longer be available for purchase on these platforms.
However, this is not the end of the battle! Sanctus Reach and Armageddon will remain available on GOG.com, where you can continue to purchase and enjoy the full franchise DRM-free.
If you've already purchased the game on Steam, don't worry — it will remain in your library, and you'll still be able to download and play it as usual.
Thank you for your continued support
https://www.slitherine.com/news/warhammer-40000-sanctus-reach-and-warhammer-40000-armageddon-are-leaving-our-website-and-steam
PS, @BattleChaing: "Delisting" is the term more of us would be familiar with (removing is generally used more for minor content, not full releases; eg, "Removing the paladin class because The Holy Order of The Teabag has ruined the class for everyone in the game"); If you change "Removing" to "Delisting" it'll pop more in the front page short-list. Might get more of the site's relevant users to get their eyes on the thread.
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It's cheaper in the Humble store, especially if you have extra discount.
Also it's still in a Fanatical bundle for almost 2 more days with the dlc pack as an other option (3 for 4.95 eur).
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Just now i've know about Sanctus Reach, and on the announcement is says that the franchise of Warhammer 40,000: Armageddon will be delisted, so most likely Warhammer 40,000: Armageddon - Da Orks will also be removed.
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https://steamcommunity.com/app/502370/discussions/0/560246171171379079/ sanctus reach also getting removed!
https://www.fanatical.com/ru/pick-and-mix/build-your-own-bundle-warhammer-40-000-battles best bet to use this bundle !
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https://www.steamgifts.com/discussion/g0Bfy/fanatical-build-your-own-bundle-warhammer-40-000-battles
for more comfortable view of the bundle
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If you have this is in your library make sure to add the free dlc to your library before it is also delisted.
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It's cheaper on Fanatical (remaining 35 hours). $1.65 - $1.45 per item. $3 for the game plus its DLC (no OST).
Build your own Bundle: Warhammer 40,000 Battles (Spring 2005)
https://www.fanatical.com/es/pick-and-mix/build-your-own-bundle-warhammer-40-000-battles
Warhammer 40,000: Sanctus & Warhammer 40,000: Armageddon + Other game or dlc for $4.5
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It's still up for 10 hours or so, but the Armageddon DLC is OoS.
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Steam page: https://store.steampowered.com/app/312370/Warhammer_40000_Armageddon/
Announcement: https://store.steampowered.com/news/app/312370/view/562497971311083656?l=english
Game contains trading cards.
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