From the blog: HTC One M9 hands-on preview | Android Central
Some key points:
810 Snapdragon
Octa core 64 bit
20 MP main camera
2 Ultra Pixel front camera, f/2.0 ultra wide angle
Some key points:
810 Snapdragon
Octa core 64 bit
20 MP main camera
2 Ultra Pixel front camera, f/2.0 ultra wide angle