Overview for Raspberry Pi Mode B+:

Dual step-down (buck) power supply for 3.3V and 1.8V. 5V supply has polarity protection, 2A fuse and hot-swap protection. New USB/Ethernet controller chip. 4 USB ports instead of 2 ports. 40 GPIO pins instead of 26. The top/first 26 pins match the original layout, 9 additional GPIO and 2 EEPROM Plate identification pins. Composite (NTSC/PAL) video now integrated into 4-pole 3.5mm 'headphone' jack. MicroSD card socket instead of full size SD. Four mounting holes in rectangular layout. Many connectors moved around. What's not new:

Same basic size, 85mm x 56mm Same Processor, Broadcom SoC running at 700MHz (can be overclocked) Same RAM, 512MB soldered on top of the Broadcom chip Same power connector, microUSB Same software - identical operating systems will work fine, just make sure you have versions that are later than June 2014 First 26-pins of GPIO are the same Same HDMI port Audio part of the A/V jack is the same Same Camera and DSI Display connector You can refer to the sku.267945 and sku.305507 for Raspberry Pi Mode B.