It was 6 million by March (or end of) we were told. And we're told they are capable of 1 million units a month. So that'd be 3 million needed by the end of the calendar year, not 2 million. I can't remember any specific numbers for units other than 6 million by March though.
Actually Sony stated on a number of occassions 4M units in CY 2006.
EDIT: Heh, beat and links.