In a not so shocking move, Microsoft pulled the Nokia Camera App from the store yesterday to ready it for a name change, and apparently 2 different versions for future use. The first is Nokia Camera Classic, which appears to be only compatible with devices that will see the Lumia Denim update. These include the later generation Lumia devices and the Icon. The description and version numbers are exactly the same between the Classic version and the stock Lumia Camera that everyone else will be getting, so it appears that releasing Classic is just a way to segment the App for future updates. You can be assured that the 830 will end up with more powerful camera software then the 520 will in the future.
The biggest question I have is why the lack of support for the 1020 with your premiere camera software?