I don't think this counts digital preorders, or preorders outside of the US.
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US is also well known to be XBOX main fan base: http://venturebeat.com/2014/06/20/ps4-vs-xbox-one-in-the-u-s-heres-a-state-by-state-breakdown-of-the-console-war/ So the data is terribly skewed - meaning that the fact PS4 is still on top is even more significant than OP thinks.