This unlocked dual sim device is selling for 405 USD in Romania but for other markets it may not be so. As it was declared at MWC 2014 HTC Desire 816 has 6.17 x 3.10 x 0.31 inches dimensions and operates on Android 4.4.2 KitKat system having 5.5 inch display with 720 pixels. It also has quad-core 1.6 GHz snapdragon 400 processor, 13mega pixel camera located in the back and 5 mega pixels in front. It has 1.5 GB of Ram which can be extended to 8 GB internal memory its battery capacity is 2,600 mAh.
This is likely to be released in UK and to US probably through AT&T.