Official Tech Specification:-
Size and weight
Height: 4.5 inches (115.2 mm)
Width: 2.31 inches (58.6 mm)
Depth: 0.37 inch (9.3 mm)
Weight: 4.8 ounces (137 grams)
Display
* Retina display
* 3.5-inch (diagonal) widescreen Multi-Touch display
* 960-by-640-pixel resolution at 326 ppi
* 800:1 contrast ratio (typical)
* Fingerprint-resistant oleophobic coating on front and back
* Support for display of multiple languages and characters simultaneously
TV and video
* Video formats supported: H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format
Camera, photos, and video
* Video recording, HD (720p) up to 30 frames per second with audio
* 5-megapixel still camera
* VGA-quality photos and video at up to 30 frames per second with the front camera
* Tap to focus video or still images
* LED flash
* Photo and video geotagging
Sensors
* Three-axis gyro
* Accelerometer
* Proximity sensor
* Ambient light sensor
Only list specification which different from previous model
Full specification from Apple site:-
http://www.apple.com/iphone/specs.html