This game should continue to climb to around 1.2 million copies. I strongly believe that PAL regions will be able to sell nearly as many copies as the US has. Considering that in the US CoD3 has sold 639,750 and usually PAL regions match or are a little under the US version, this game should sell at least 1 million copies, if not a little higher.
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Sources:
http://www.vgchartz.com/amonthly.php