Happy 4M, Wikimedia Commons
According to this German blog, the four millionth file at Wikimedia Commons is this one:

Thanks, Kallerna, and everyone who contributes to Wikimedia Commons, for making it what it is today — despite all the difficulties.
3M was July last year, 8 months ago, about the same length of time it took us to get from 2M to 3M. During the last few months, Commons has received a significant boost from the Bundesarchiv project, which will eventually end up as 100,000 images donated. So it seems that the contribution growth is basically steady since 2007.
See also my post around the time of 3M, The coming challenges for Wikimedia Commons.

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