Google seems to be testing, once again, image thumbnails in the web search results when on mobile.
Dan Smullen posted on Twitter a screen shot of him seeing image thumbnails in the mobile search results for a search on [green car]. I personally cannot replicate it, but as soon as I covered it on Friday at SEL, I asked Google about it and I have yet to hear back.
Here is a screen shot from Dan:
Again, this is a test we saw back a couple years ago but haven't seen Google test much since then.
Forum discussion at Twitter.