When navigating through content blocks, assistive technologies need to report and inform users about what kind of block they just landed on. Content blocks need to be labeled someway, an din a way that screen readers can announce properly.

Currently, there's nothing that can be announced in the markup. Blocks are just always the same:

Maybe, and aria-label attribute on the focusable blocks (with an appropriate text to report the type of blocks) could help. This should be carefully tested though.

This relates also to #557 where the block mover should announce which kind of block it relates to.

Maybe, each block should carry a set of meta information available to be reused in other context. I see the state contains information about the blocks UID so maybe it should also contain a human-understandable name for each kind of blocks, to start with.