According to latest leaks and rumors, the specifications of HTC One 2 aka HTC M8 aka HTC One+ include a 2900mAh battery, NFC, Gorilla Glass 3 protection and maybe a memory card slot.
The HTC One successor is likely to be powered by Qualcomm Snapdragon 800 (or 805) processor (MSM8974), with 2GB of RAM.
Similar to the HTC One, the M8 will sport a full-HD (1080p) display with slightly bigger screen size at 5-inch, tweeted @evleaks.
HTC One 2 will feature an UltraPixel rear camera (maybe 6MP or 8MP) and a 2.1MP front camera. The new smartphone will support Gigabit Wi-Fi (802.11ac) and run Android 4.4 KitKat OS with Sense 6.0, a new version of HTC’s UI.
The phone is likely to available in the first quarter of 2014 in the US.