If you end up using this approach, I'm pretty sure the standard convention in iOS is to have the negative button on the left.

Most people will just click yes or no to get past this screen. Better to ask "What iPad device are you using?" With options (with pictures?) of "iPad Mini" and "iPad 1/2/3"

/4

You forgot [cancel]

Wouldn't "No" be considered "Cancel" in that situation?

People will want a Cancel button because they don't want to be asked a question at that time, but then they'll want to be able to answer (or change the answer) to the question later; e.g. on an options screen.

It was also partially a joke, remembering one WTF moment I had with Windows Vista (don't know if it still happens):

    +--------------------------+
    |                          |
    |     An error occured!    |
    |                          |
    |  [yes]  [ No ]  [cancel] |
    |                          |
    +--------------------------+

Yes, people forget that Cancel is the answer in the case of "I didn't mean to click the thing that triggered this box".

Exactly what I was thinking... almost.

In the option screen, just put a little switch to turn iPad Mini formatting on or off.