Country variants of Nokia Lumia 930 and 1520 in Australia are now receiving Lumia Denim update. Same goes for the Lumia 635, 930 and 1520 users on O2 UK which according to the official Microsoft support page are getting this update. There are reports of unlocked Lumia 1520 users in UK getting Denim update as well.
The new Denim update brings Lumia Camera 5.0 app that enables 4k video support, faster app startup times and rich capture including HDR capabilities.
Check if your phone is receiving the update by going to Settings> Phone Updates and tap on Check for Updates.