Not sure what the arrow means, but it seems to be rolled out to everybody (at least I see it in different browsers, including ‘incognito’ mode). Does anybody have a clue? (See Update below)
Screenshots are below:
UPDATE:
Seems like arrow is used for navigation — you can press “up” and “down” keys, which is not very intuitive (I personally tried “j”/”k” shortcuts just like in Gmail).
Slavik blogs about online marketing, user experience, search engine optimization, and mobile. Co-founder of Volinsky Consulting — web design & user experience company in Albany, NY. He's on Google+ and on twitter:
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Slavik: nice find. It actually impacts search more then you may realize. I explain further here: http://www.seo-naturale.com/seo/googles-little-blue-arrow/