Another of the many new features in iOS5, is Newsstand.
Newsstand is an app from Apple that allow you to buy, read, and store all your favourite magazines, newspapers, and periodicals – as long as Apple stocks them, of course.
The publications will be available for purchase in that app store.
Whenever new issues become available, the app will update in the background, changing the front cover on display too. It is not clear, however, whether or not you can choose to purchase a one-off issue, without subscribing.