I completly agree with this comment, I can't see why you would want an isight cam in a mini as nobody I know of that owns a mini has or would want it mounted on top of their tv/monitor. Most people have the mini tucked away in a corner out the way.
i don't mean to be rude but its a silly idea to put the isight in the mini itself, remember when apple introduced the isight they said should be at eye level so you can make eye contact, as has been said in other posts no one wants to see the under side of your chin and alot of people keep there mini tucked away, i would like apple to release a new external isight but they really want you to spend the money on the new led displays with the isight in them.