What probably matters to youSection of the release
What
The prompt editor gained forward-word, backward-word, kill-word and backward-kill-word operations, and deleting to end of line now stores the removed text so it can be yanked back instead of being thrown away.
Details
Delete-word-before and delete-WORD-before were rewritten on top of a shared killRange helper, as was delete-to-end-of-line.
Placeholder spans in the prompt are still snapped out of at both ends of a motion.
Evidence
backwardKillWord()
Strings lifted out of the shipped bundle, so the claim above can be checked against them.