A few weeks ago in Abu Dhabi Nokia announced real DNG file format support for the Lumia 1020 and 1520. Today they’ve pushed out the update to enable that, so if you really like to fiddle with your images then your going to be happy.
But there is a catch, you’ll need the as yet unreleased Nokia Black update.
In the meantime you can update the app anyway, wishing you could output RAW files.