Lumia Camera Classic is updated to a newer version for Lumia Windows Phone users. This is an app for those Lumia devices which do not get the camera improvements after updating to Lumia Denim.
The devices which get the new Lumia Camera 5.0 app are only the Lumia 830, 930 and 1520 and hence this ‘Classic’ app is for the rest of the Lumia devices. It brings all the features of the previous Lumia Camera app, says the Windows Phone Store page.
The update changed the version of the app to v220.127.116.11, but there is no changelog provided in the Store.
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