I wonder if that's the new version of Lumia Camera for the 1020 Gabe Aul mentioned a few days ago:
"We also wanted to talk a little bit about Lumia 1020 camera features on Windows 10. Owners of the Lumia 1020 love using their phone’s amazing camera to capture high-fidelity photos and videos. If you recently upgraded your Lumia 1020 to a Windows 10 Insider Preview build, you might have been disappointed that your camera wasn’t working like you expect. Many of the Lumia 1020’s camera features, like 41MP capture and DNG files, only work with the Lumia Camera app. While the app works with Windows 10 Mobile, it won’t be available for download from the Store until later this fall.
To get all your Lumia 1020 camera features back, you need the Lumia Camera app installed on your phone. The easy solution is to wait until the app is available in the Store. If you don’t want to wait, you need to use the Windows Phone Recovery Tool to return to Windows Phone 8.1 in order to get the app back."