If you're a developer wondering how to link users directly to the App Store update page for your app, you're in luck, Gabe has posted the URL format up on Stack Overflow.
Turns out the phobos links do still work and you can link directly to the update page using this URL format:
Of course replacing the [APPID] with your own app id, not including the brackets. This will link directly to the latest update for the app, instead of the main app page.
It should work on-device for an app with a waiting update. If you give it a try, let us know how it goes and if you have any other developer tips for us, send them in!