I have the same thought.. . . my suspicion is that shipment of early orders will be coming from US stock—at least for US orders. . .
And actually I should correct my earlier statement - as can be seen from the excerpt I pulled from Apple's press release on the mini, they didn't say it would be available ON the 16th, they said 'beginning the week of the 16th'.
What we are all fussing about is simply confirming that they are doing what they said they would do, a full month ago (the press release announcing the mini is dated Oct 13th, in fact).