^That's what the difference between "original" and "final" is on the tables on the first page.
The original VGC figures will be filled in as we go along, and we can get an idea as to how we are doing like that.
The final figures won't really be final because adjustments quite often back-date a long way... for instance the ones I used for last years I collected from the site in July, but when I posted the article they had changed again by a few 1000 units.
However if I wait until a couple of weeks after the Fiscal Year results are in (ie mid-late May 2010) then any major adjustments to the Christmas 2009 figures will be over, so it should be accurate enough.