Microsoft has finally offered more details regarding its new Lumia Denim update for Windows Phone 8.1 handsets, announcing exciting new features and enhancements.

The Lumia Denim update will come packed with all sorts of features and improvements, and it will even add the ability to record 4K video, albeit only for a few select smartphones. More specifically, 4K video recording will be reserved for the higher-end Nokia Lumia 930, Lumia Icon, and Lumia 1520.

Nevertheless, a number of exciting new features and enhancements are in store for the rest of the Lumia lineup as well, including new camera features and others. For the elite Lumia 930, Lumia Icon, and Lumia 1520, the Lumia Denim update will add the ability to record 4K video at 24 frames per second (fps) with a long press of the camera button.

"What can you expect from the upcoming Lumia Denim Update? Besides Cortana, live folders, SMS merging and many other improvements, there are of course fantastic unique imaging enhancements, too," Microsoft boasted in a company blog post.

On the other hand, Microsoft still doesn't have a specific date for when the Lumia Denim will start rolling out to all Windows Phone 8.1 devices. The company has already started pushing out the update, but only in a limited fashion at this point. Lumia Denim will hit more devices next year, but the rollout will be gradual and it may take a while to hit all eligible devices.

"The Lumia Denim update has started rolling out to a limited number of devices in select markets, and will continue arriving in waves by device," the company added. "A wider rollout of Lumia Denim to all Lumia smartphones running Windows Phone 8.1 is expected to begin in early January, following partner testing and approvals."

Lumia smartphone owners should have the Lumia Cyan software installed in order to receive the Lumia Denim update, but it remains to be seen which Windows 8.1 devices will be the first in line to get the treat.

We'll make sure to keep you up to date as soon as the company offers more details, so check back. In the meantime, head over to Microsoft's blog post for more details regarding the features included in Lumia Denim.