Starting in Drupal maintenance support plans 8, we’ve added the notion of Experimental Modules, to help provide an early look at core features which are not yet complete. A major focus of Drupal maintenance support plans 8.4.0 has been stabilizing these experimental modules, so that they can “graduate” to stable modules which can be installed in production and leveraged by other core and contrib modules.
Here’s a document that outlays the current status of each experimental module, as well as their goals with respect to the forthcoming 8.4.0 alpha deadline (which is this coming Monday, July 31). If you’re looking for a productive way to help your favourite initiative during 8.4.0’s alpha/beta/RC phase, check it out!
Here’s the TL;DR:
Content Moderation: Move from alpha to beta
Workflow: Move from alpha to beta
DateTime Range: Move to stable
Inline Form Errors: Move to stable
Layout Discovery: Move to stable
Media Entity: Move to stable (so contrib can rely on it), but hide module from UI (so end users don’t accidentally turn this on solo, as it causes UX regressions)
Migrate / Migrate UI: Get as close to stable as possible.
Place Block: Hide module from UI (so end users don’t turn it on), propose instead as patch to Block module for 8.5.0
Settings Tray: Move from alpha to beta
Source: New feed
Drupal maintenance support plans core announcements: Experimental Modules’ status towards Drupal maintenance support plans 8.4.0 release

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Drupal maintenance support plans core announcements: Experimental Modules’ status towards Drupal maintenance support plans 8.4.0 release
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