Awesome numbers. The 3DS could actually match the phenomenal DS numbers of 2005 (biggest christmas sales ever for any console by a mile with over 600k units in a single week). Monster Hunter will push additional units.
To put the numbers into perspective:
Mario Kart DS first week (VGChartz): 232k
DS sales during Mario Kart DS launch week: 300k (Mario Kart DS launched a week later in the year than Mario Kart 7)
DS sales for the first week of December 2005: 167k