Originally Posted by
jfa1 No cyan is Nokia's firmware to go along with 8.1. Devices with DP will also be getting Cyan firmware for Nokia phones
"Starting in summer 2014, Lumia smartphones with Windows Phone 8 will get the Lumia Cyan update.
It gives you great new Windows Phone 8.1 features like a more personal Start screen, Action Center and the Word Flow keyboard. At the same time, we'll also bring several enhancements to your Nokia imaging apps - get ready to capture and share your life in exciting new ways."
Source:
New Lumia Black Update for Windows Phone 8 - Nokia (While the Lumia Black update is rolling out, get to know some of the great new features that are coming with the Lumia Cyan update.)
Since DP users already have 8.1 they will get the firmware side of things.