The HTC One M9+ has a slightly larger 5.2 inch display with 2K resolution, MediaTek Helio X10 processor, 20-megapixel Duo Camera, front facing UltraPixel camera, and fingerprint sensor. The device has the same dual tone color options and design as the M9, along with front facing HTC BoomSound speakers.
The Duo Camera on the M8 was a fun way to capture photos to share with family and friends and I wish the M9 would have kept that secondary sensor around to offer a unique feature over other smartphone.
The One M9+ fingerprint sensor is not a home button like the iPhone and Galaxy S6, but does implement finger placement rather than finger scrolling like the HTC One Max did last year.
HTC issued the following statement:
HTC is excited to bring the HTC One M9+ to customers in China, where we have worked closely with mobile operators to create a phone with the right balance of screen size, processor performance, software, and radio network compatibility to meet consumers' needs. Ranging in other markets will be confirmed locally at a later date. The One M9+ is not currently planned to be released in North America or Europe, where we believe our flagship HTC One M9 is the best choice for blazing fast performance, incredible sound, and network compatibility across the broadest range of operators.
HTC's focus outside of China is on the HTC One M9. The higher display resolution and fingerprint sensor aren't something I care too much about, but I would have liked the Duo Camera on the M9.