Microsoft is testing a new image carousel within the Bing Search results. This image carousel shows two rows of images, instead of one, has related searches with an arrow at the top of the carousel and a new larger squared off arrow format.
This was spotted by Frank Sandtmann who posted about it on Mastodon. He wrote, "Bing is testing a new version of its image pack. It is more visible and features two large, highlighted horizontal scrolling options."
I was able to replicate it, here is the new version:
And here is the original version:
Forum discussion at Mastodon.