The Desire 820 is the successor of the Desire 816. It has the same 5.5" LCD display with HD resolution.
There's a 13 MP camera at the back and the front camera has upgraded to 8 MP resolution.
Just like the Desire 816, the Desire 820 features HTC BoomSound dual front stereo speakers. The HTC Desire 820 will be available in Marble White, Tuxedo Grey, Santorini White, Milky-way Grey, Tangerine White, Saffron Grey, Flamingo Grey, Blue Mist, and Monarch Orange.
It will ship with the latest HTC software and will be available later this fall, with availability varying by country and region. Stay tuned for more information.