Looks like Google is testing a potential new knowledge graph feature for websearch. Appears to be early testing, so there is no promise that it will land on the live servers and it's likely that in case it will go live, it won't be within the next three months.

Basically, it's an interactive event timeline based on data from wikipedia.

This was also published in German:
http://stadt-bremerhaven.de/google-knowledge-graph-zeitachsen/
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2014-07-26
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