I would love to use the Gallery Card, or some other new card like the Gallery, to be able to display a number of external (non-Hub) websites. Currently the card is limited to content exclusively in ArcGIS online, but the feature would be great to summarize a group of websites with short descriptions.
My only alternative is customizing cards and wide cards within the Text Card, but these are static and do not rotate or cycle, which is a user-friendly feature.
Ideally the gallery cards would automatically bring the external website's logo through, as well (or some other image).