Aside from the 3 new Lumias that were revealed in Berlin, another cool update is coming on Windows Phone 8.1-powered Nokia phones
This is Lumia Denim update. There are two of the many improvements that I love. One is for the Cortana voice support which you can now talk to her even that it is on idle state. Two is during at the said state, press and hold the camera button and the phone will launch the camera app. 
The Lumia Denim is already out of the box when you have the Lumia 830, Lumia 730 and Lumia 735. For other Lumia devices, it will start rolling out this 4th quarter of 2014. You can check the full details of the Lumia Denim at conversations.nokia.com
