I think (still haven't seen it myself!), this is a tweak following on from instant launching, and is allowing keyboard controls - you can move the blue arrow I think with arrow keys, then hit enter to activate the relevant result.
It has been said elsewhere that the arrow appears to draw the users eye in, and *could* look like some sort of endorsement, so when on sponsored, it will be interesting to see the effect on ppc costs and clicks!
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