Kevin Walzer of Code by Kevin has sent an open letter to registered users of the applications he has developed, describing some of the changes the new Mac App Store will impose. The open letter is a request for feedback on the changes, along with opinions regarding Walzer's choice to develop for the store or not. From the customer's standpoint there will be no more 'try before you buy' offers, as demos will not be allowed. There will be no upgrade path outside of the App Store -- customers will have to pay full price for a new version of an app on the Mac App Store,
