Button: Using <placeholder name="name"/> instead of button in a bunch of places.
Popup: Documenting the two different types of the "arrow" option separately.
Option enhanced: Factoring out into includes/widget-option-enhanced.xml
Collapsibleset: Modify blurb about initSelector option.
Adding include for option initSelector.
button and buttonMarkup: Marking option iconshadow as deprecated.
Filterable: New entry.