It was completely redesigned and includes the following features:

• Larger size, matches the Arduino MEGA 2560 R3 and Arduino DUE board size
• PADS don't touch the Arduino USB connector, so more tapes on Arduino boards!
• Central GND bus
• Central VCC bus (5V - 3.3V selectable)
• SOIC-8 SMD component area
• General purpose switch area
• Holes matching the ones on the Arduino MEGA board
• ic2 area
• 20-pin DIP IC area
• reset switch area
• All headers matches 100% the position of the Arduino MEGA board
• Black soldermask!!!