I cannot believe this will be Apple's big upgrade for the year, especially in the mini. If it is, I'm afraid for the future. No none is waiting with baited breathe for a better camera. This will be a (relative) flop IF that's it.
Even Cook cited supply issues with the iMac and acknowledged is caused sales of iMacs to go way down. Apple doesn't need to keep supplies tight as they sell at a fixed price whether they have 1 million or 10 million units available.
If this is true, it shows huge problems for Apple. Supply constraints have been a problem for Apple (iMac) in the past. If Apple with it's locked up vendors and billions of $ cash cannot get a working supply chain to build its products it has a serious problem. Can't make the product, people will buy crap products instead. Apple is best, but it's not better than nothing.