iPad mini has sold more in its first 3 days than the highest selling Android tablet (Nexus 7) has sold in the past month.
The mini sold 1 million in its first 3 days, and google have recently announced that they are now shipping 1 million Nexus 7's per month. This means that the iPad mini has sold more in 3 days than the Nexus 7 has in the past 1 1/2 months probably (because they won't have sold all the units they've shipped).
There were huge supply constraints on the iPad mini too; it was sold out basically everywhere. Android simply can't compete with Apple in the tablet market. Time will tell if MS can...
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right