Nokia Lumia 820 is also going to launch on 5th September, 2012. Images and specifications of this smart phone have been already leaked through various sources and people are making different assumptions too.
This purple back is also an assumption, which is based on few leaked images. It has been said that HTC is planning to launch a series of smart phones, which will be just like Lumia series. HTC has already launched a smartphone in electric purple color and Lumia 820 will have more attractive royal purple color to compete. However, it is an assumption and we have to wait for the official launch of the Lumia 820 to see the colors offered by the Nokia, for this smartphone.