Australian carriers Telstra and Vodafone are known for letting the users know software update roll-out schedule in advance. Vodafone Australia has just informed that it plans to roll-out Lumia Denim (Windows Phone 8.1 update 1 + Lumia Denim firmware) to Lumia 720, Lumia 735, Lumia 820, Lumia 925 and Lumia 930 by late December to early January. The only problem is that Microsoft has not yet submitted the software for testing to the carrier.
It clearly indicates that Lumia 830 and Lumia 735 are also set to receive latest Lumia Denim firmware update, in spite of shipping with early versions of Lumia Denim pre-installed. The Lumia Camera 5 will come to Lumia 830 with latest Lumia Denim update OTA only and that has also been confirmed by Microsoft.
Thanks Nate & Gill for the tip. Cheers!!