Photo: Photos that are links or zoomable now require alt text (using a caption or checking the "Alt text not required" is not enough). This prevents accessibility errors of links with no text.
Flex Module: Alt text is now required (and correctly added to the page) when a flex module has a video in place of a photo.
Google Site Map: The generated Google-format sitemap now excludes any links that are not a descendent of the URL used to generate the sitemap. Outside links are ignored by Google and trigger a warning.