The Lumia Denim update is rumored to begin rolling out in a couple of weeks if the guys at NokiaPowerUser sources are accurate. They have posted an article on what they have heard as far as the roll-out is concerned.
The Lumia Denim update which is scheduled to begin rolling out this Q4 (between October, November and December), will bring a lot of improvements and new features to Lumia devices, notably the “Hey Cortana” feature, which uses voice activation to use Cortana and a lot of improvements to imaging especially 4K video recording, HDR, faster camera processing and more (all of which will come with the Lumia camera app).
As we all know the Lumia Cyan update is still being rolled out, as Microsoft has stepped it up a notch, most internationally unlocked Lumia already have received the update, though those left are the carrier variants whose update roll-outs are still pending carrier approval.
The Lumia 730 and 830 already selling comes with Lumia Denim. If these latest rumor is true, then maybe we could see denim features released for developer preview handsets sooner than 2 weeks?
Only time will tell.