There are minor user experience issues with the mini due to its smaller size. I mentioned earlier the back button on safari being close to the tab closer. And yeah the keyboard splitters a little strange now. Note- taking apps need the magnifier now where in the larger ipad it wasn't absolutely necessary.etc etc.
Why wouldn't a designer consider this stuff and adapt to it?
Further, why wouldn't they design to the smaller, newer device to maximize user experience and decrease update frequency and enhance sales?
I give the ipad 2 8 months depending on success of the mini sales.