• All deprecated functions have been removed
• Keyboard Shorcuts are now part of an extension and not attached to specific button/commands
• Placeholders are now part of an extension with its own dedicated options
• Toolbar is now an extension with its own dedicated options
• firstHeader and secondHeader are gone you should use h1 thru h6
• Support pre-releases
• Buttons
  • The array of buttons can now contain objects, for overriding any part of the button object
    • This replaces the custom object value for the buttonLabels option
• API
  • Unique id for MediumEditor instance will now remain unique (regardless of how many instances are created)
  • .statics references are gone
  • .trigger supports triggering events without needing to declare the event
  • .callExtensions(), .setToolbarPosition(), and .hideToolbarDefaultActions() have been removed
• Extension
  • .window & .document are now exposed as members of the Extension
  • init no longer is passed MediumEditor instance as first argument
• CSS
  • All classes are now medium-editor prefixed
• Util
  • getProp, derives, getSelectionData, setObject & getObject are gone
  • getSelectionRange & getSelectionStart are now in Selection