Well, Google finally confirmed this morning that there was a core ranking change but unrelated to Penguin - as we expected.
It broke this morning with Zineb from Google posting in French:
That means there was no name [for the update]. It is simply one of frequent quality updates.
Gary Illyes confirmed the translation and what happened:
And John Mueller did also:
We had several core updates that Google has confirmed in the past, so this is one of the rare ones that Google has indeed confirmed.
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