Experience Builder now lets you Discard previously auto-saved changes as well as Publish or Discard a subset of changes.
JavaScript utility functions are shipped for fetching data from within JavaScript Code Components, which is needed for displaying navigation menus or other dynamic data from Drupal. The previous feature of Code Components being able to override the rendering of Drupal Blocks is now superseded by this and has been removed. See the sample code / docs when creating a new Code Component for details.