Drupal 8 has content blocks, which are entities with fields. You can create a new block type, and then create individual instances of it, which can be placed just like normal blocks.
However, the creation of the new content block instances and placing the blocks are two separate steps, done in two separate places.
Instead, we'd like to be able to create new content block instances from the same UI where you place blocks, similar to how Fieldable Panels Panes works in Drupal 7.
Ideally, this should be implemented as a reusable class that we can use in Panels and to override the core block placement dialog.
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Comment #2
dsnopek