Features
More Energy Efficiency (Less Power Required)
Improved Power Management: Manage More Devices from Your Pi!
Bigger and Better projects via an Expanded GPIO Header (40 pins vs. 26)
Increased connectivity - 2 Extra USB ports (making a total of 4) and a new 4-pole connector replace the existing analogue and composite video port on the Model B.
Smaller compact design
General Specs
Dimensions 85mm x 56mm
Chip Broadcom BCM2835 SoC full HD multimedia applications processor
CPU 700 MHz Low Power ARM1176JZ-F Applications Processor
GPU Dual Core VideoCore IV? Multimedia Co-Processor
RAM 512 MB SDRAM @ 400 MHz
Storage MicroSD
USB 2.0 4 x USB Ports
Ethernet 1x 10/100mb Ethernet RJ45 Jack
Video Connections HDMI Composite RCA (shared with audio jack)
Supported Resolutions 640×350 to 1920×1200 including 1080p PAL & NTSC standards
Audio Multi-Channel HD Audio over HDMI Stereo from 3.5 mm jack
Operating Systems  Raspbian RaspBMC Arch Linux Risc OS OpenELEC Pidora
Power Draw / voltage  600mA up to 1.8A @ 5V
GPIO 40 Other Connectivity: 1x CSI-2 for Raspberry Pi camera modules
1x DSI for Raspberry Pi displays
Power Source: 1x Micro-USB