I wouldn't count on it any time soon. Currently those apps are going to be the ones you get because the iPad /iPhone is still somewhat of a specialty device. I

I wouldn't count on it any time soon. Currently those apps are going to be the ones you get because the iPad /iPhone is still somewhat of a specialty device. I don't think we'll see it iOS 6 but possibly in later versions of the operating system. As the platform becomes even more mature and people begin to use it more as a primary device I can see Apple letting you swap out default apps.