Would be nice to be able to change the date format for the form display (when editing node). Currently in Drupal 8.0.1, you can only change it for manage display only (when node is viewed).
Personally, I don't like how I have to select my date in the form display (when editing node) and not able to just type it in like in Drupal 7.
PS: I haven't had the chance to test Drupal 8.0.2, which came out today, I highly doubt this feature was added.