Featured Snippet Image Carousel in Google SERPs

Looks like Google is testing Featured Snippets with image carousels in the SERPs. From the looks of it, the images come from different sites and feels like a mashup of the image pack with the featured snippet. Also, it appears that the pages from where the images are pulled are not de-duped from the 10 blue links, phew.

Sample query: what is google featured snippets