Google is now providing a thumbnail for flash video, which you
probably know already.

Now I see that they're also providing a thumbnail image for our
interactive 360 panoramas. This is great for us!

If you check our SERP – here are some examples

http://www.google.com/search?q=amedee+coral+reef

http://www.google.com/search?q=stanley+povoda

http://www.google.com/search?q=obama+prague

some don't work even if we're the #1 result
http://www.google.com/search?q=prague+pissing+men

and the obama one doesn't show a thumbnail if you search for something else
http://www.google.com/search?q=prague+panorama
(same page as the above obama prague search is #8 on this search)