What probably matters to youSection of the release
What
Ctrl+Backspace now deletes the word before the cursor in the prompt editor, matching what Alt/Option+Backspace already did.
Details
The backspace handler's modifier check widened from Meta only to Meta or Ctrl.
In one editing mode the deletion routes through the kill-word path rather than a plain word delete, so the removed text lands in the kill ring and can be yanked back.
Evidence
backwardKillWord
Strings lifted out of the shipped bundle, so the claim above can be checked against them.