Today, Apple comes with a new feature. They expanded iTunes Preview, that has been available for music for a couple of months now, for the appstore. Now, when you click on a link, that would open the app in the app store, iTunes will also, automatically open in a web browser as well
Apple Expands iTunes Preview For The Appstore
Now, when you click on a link that leads directly to an app in the appstore, iTunes will load automatically, but you will get all the details on a webpage as well.