Mojang has announced an update: it will be ending support for "certain older devices and platforms where Minecraft is available." This affects Minecraft (Gear VR), Minecraft (WP), Minecraft (Win 10), Minecraft (Android), Minecraft (Kindle Fire), and Minecraft (iOS), as Mojang says "Minecraft will no longer be updated or supported on Gear VR, Windows 10 Mobile, Android devices with less than 768MB of RAM, iOS devices running iOS 10 or below, or video cards that only support DirectX 10.1 or below."
The Minecraft team says "This will prevent current players on Gear VR and Windows 10 Mobile devices from using multiplayer or Realms from these unsupported devices." They add that players with a Realms subscription will still be able to access their Realm "from affected devices until they choose to update it on a different device" but that "multiplayer will only work between devices on the same version."
The announcement stresses that you can still play Minecraft on any of these affected devices after October 2020. "You can keep building in your world, and your Marketplace purchases (including Minecoins) will continue to be available. If you have signed in with a Microsoft/Xbox Live account, your Marketplace purchases & Minecoins and your Realms subscription will be available on other platforms." If you want to, you'll be able to move your worlds to a different device by "by uploading the world to a Realm, and downloading a backup onto your new device." You'll also be able to request a refund for your Minecraft Realms subscription after October.
If you're still making your way through the game on any of these devices, don't forget to check out the main Minecraft walkthrough by BulletLukey, edited by Itzz Sh0wt1m3 and overseen by Reborn Insanity to help you get up to speed before October.
Thanks to everyone who sent this in as a news tip