A trusted insider report close to HTC has leaked info about the HTC One (M9) aka Hima Main camera sensor. He says with certainty the new One (M9) will feature a DUAL 20MP camera sensors (20MP + 20MP) at the back, a dual setup similar to the one introduced with the previous One (M8) flagship. The flash should be dual-tone dual-LED flash, just like before.
The insider source also confirms HTC won't be giving up on the UltraPixel technology and it will use a 4 UltraPixel sensor for the front camera, intended for selfies
HTC One (M9) is expected to pack a 5" 1080p display and run on the latest generation Snapdragon 810 chipset with an octa-core processor, Adreno 430 graphics and 3GB of RAM. The flagship will powered by Android 5.0.2 Lollipop with HTC Sense 7.0 UI.