Independent developers are doing a pretty decent job of this on their own with x-callback-url. Without Apple's buy-in, of course, it's not quite the same thing.

Independent developers are doing a pretty decent job of this on their own with x-callback-url. Without Apple's buy-in, of course, it's not quite the same thing. http://x-callback-url.com/ http://x-callback-url.com/ has the info.