Cyan is history as Lumia Denim firmware starts to roll out in China for some specific devices. The Lumia 520,525,526,625,720 and 1320 in China have started to get the Lumia Denim update.
Lumia Denim gets some exciting features to some specific devices. To name a few, “Hey, Cortana” passive voice activation for devices with Snapdragon 8xx processors, or maybe the New Lumia Camera features which are device specific too. Expect your device to perform better in terms of battery and speed with Denim (though we don’t have any review yet)
Remember to backup and reset your phone after the update if you are experiencing some lag. Resetting is very easy and shouldn’t take more than 20min for the whole,process. Stay tuned for more info about Lumia Denim for your device and your region