It’s a significant update. The Arduino UNO and Arduino Mega 2560 update the Duemilanove and Mega respectively. They now use an ATMega8U2 instead of an FTDI USB to serial converter chip.

The cube itself is controlled with an Arduino Mega 2560. For each frame in memory, the Arduino reads and bit shifts 49 bytes of data for an encoded duration. This allows for the cube to be applied ...

and Mega 2560 don't support the Debugger feature as they're powered by an AVR microcontroller. How Are The Boards Used With ...

There's the Arduino Giga R1 Wi-Fi featuring an impressive set of 76 pins and the Arduino Mega 2560 with a total of 70 pins.