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the PS4 managed 1 million sales in just 24 hours, in just North America alone (one region). looking at the pre-order numbers, you can expect, at maximum, maybe 500,000 day one for the Xbox One in the NA territory.
if you're including worldwide, I'd say it'll pass the one million mark the end of it's first week. but I highly doubt it's going to come anywhere near closing the gap in America.