Here are the highlights that stand out the most to me in using it as my daily phone for months:
A more refined design: it's 90% metal now, with the metal wrapping up the side (the HTC One was 70% metal). The gunmetal gray is simply gorgeous and has this great texture to it. I've also never seen a single HTC One (M8) with a gap of any kind - the entire phone is more solidly constructed.
Bigger Battery: with a 2600 mAH battery, it lasts longer. I don't have to think about charging it before the end of the day.
Bigger Storage: Yes, it's true, we put a microSD slot in there, and it supports up to 128 GB of storage. How's that for mind-blowing?
Bigger Screen: 5 inches is a nice size; not so huge like the One max, but noticeably bigger than the 4.7 inch screen on the HTC One. I got used to the 5.9" screen on the One max, but there was no adjustment period with the HTC One (M8).
Better BoomSound: The audio quality from the dual-front facing speakers on the HTC One was great...but you wouldn't believe how much better the new HTC One (M8) sounds! Richer, fuller audio with a wider sound. It's 25% louder, yes, but the audio quality is dramatically better. I didn't grasp by how much until a co-worker did a side by side comparison for me.
A Better Camera Experience: It's a 4 megapixel UltraPixel sensor, but we switched to a new provider for the sensor, completely addressed the pink tint issue, added a second sensor to get depth/spatial information (which allows for some great camera effects). Image quality is simply better.
COLORS: Gunmetal Gray, Glacial Silver, Amber Gold
DISPLAY: 5.0 inch, Full HD 1080p Corning® Gorilla® Glass 3
CPU SPEED: Qualcomm Snapdragon 801 processor / 2.5GHz quad-core CPU in Asia/China / 2.3GHz quad-core CPU in US/EMEA
PLATFORM ANDROID: Android™ 4.4 with HTC Sense 6, HTC BlinkFeed
SIM CARD TYPE: nanoSIM
CAMERA: Duo camera. Primary Camera: HTC UltraPixel camera , BSI sensor, pixel size
2.0 um, sensor size 1/3”, ƒ/2.0, 28mm lens. HTC ImageChip 2. 1080p Full HD video recording with HDR video. Secondary camera: capture depth information. Front Camera: 5MP, ƒ/2.0, BSI sensor, wide angle lens with HDR capability, 1080p Full HD video recording Gallery with UFocus, Dimension Plus, Seasons, Foregrounder, Image match.
MEMORY: Total storage: 16GB/32GB, available capacity varies. Expansion card slot supports microSD™ memory card for up to 128GB additional storage (card not included)
RAM: 2 GB DDR3
BATTERY: Embedded rechargeable Li-polymer battery. Capacity: 2600 mAh
Talk time: Up to 20 hours for 3G
Standby time: Up to 496 hours for 3G
Voltage range/frequency: 100 ~ 240 V AC, 50/60 Hz
DC output: 5V and 1.5 A
GPS: Internal GPS antenna + GLONASS, Digital compass
SENSORS: Gyro sensor, Accelerometer, Proximity sensor, Ambient light sensor, Barometer
CONNECTIVITY(3): 3.5 mm stereo audio jack, NFC (3), Bluetooth® 4.0 with aptX™ enabled
Wi-Fi®: IEEE 802.11 a/b/g/n/ac (2.4 & 5 GHz) DLNA® for wirelessly streaming media from the
phone to a compatible TV or computer, HTC Connect
Micro-USB 2.0 (5-pin) port with mobile high-definition video link (MHL) for USB or HDMI
connection (Special cable required for HDMI connection.). Support consumer infrared remote control
SOUND ENHANCEMENT: HTC BoomSound, Dual front-facing stereo speakers with built-in
amplifiers, HTC Sense Voice
2G/ 2.5G - GSM/GPRS/EDGE: 850/900/1800/1900 MHz
3G - WCDMA:
EMEA: 850/900/1900/2100 MHz with HSPA+ up to 42 Mbps
Asia: 850/900/1900/2100 MHz with HSPA+ up to 42 Mbps
AT&T: 850/1900/2100 MHz with HSPA+ up to 21 Mbps
Sprint: 850/1900/2100 MHz with HSPA up to 14.4 Mbps
Verizon: 850/900/1900/2100 MHz with HSPA+ up to 14.4 Mbps
Tmus: 850/AWS/1900/2100 MHz with HSPA+ up to 42 Mbps
3G - CDMA
Sprint & Verizon: 800/1900 MHz4G - LTE:
EMEA: 800/900/1800/2600 MHz
Asia: 700/900/1800/2100/2600 MHz
AT&T: 700/850/AWS/1800/1900/2600 MHz
Sprint: FDD 800/1900 MHz , TDD 2600 MHz
Verizon: 700/AWS/1800/2600 MHz
T-Mobile: 700/AWS MHz
Dimensions (LxWxT): 146.36 x 70.6 x 9.35 mm
So where and when can you buy it? If you're in the USA, you can buy it at a Verizon store today at 1 PM eastern time. Other carriers in the US and Canada will be taking immediate online orders, and by April 10th the phones should be in all North American carrier stores. In London, some retailers will have the phone today as well, and you'll see it pushed out to Europe and Asian markets rapidly in the coming weeks. By the end of April, the HTC One (M8) should be absolutely everywhere.