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How is the ribbon cable (with four wires) leading to the headphone jack?

I agree with those priorities, but I would also like to prioritize aesthetics of the UI and cater to a wider audience. A wider audience would be gb303 and other applications.

With four encoders, one of the buttons can be to change the encoder functions and the other button can be to change arduino mode if there are many.

The above is running the standard ARboy code.
Below is a mock up design of a new arduinoboy.

The new ARboy 'would' have:
DIN midi-in.
Two buttons, both with internal pull up resistors and with falling-edge interrupts.
6 LED's.
8 analog inputs.
Link port connected to SPI bus.

I would like to play with tri-state buffers and the Slave Select pin. This could have potential for wiring up more than one gameboy to the SPI bus. I do not know how to wire this up though, because I do not know which pins to enable and disable. Pic three has a theoretical SPI bus using Slave Select pin. I do not know what will happen if SCK is disabled though.

Another idea is that the new arduino boy could control only one gameboy, have 8 leds and use 8 pots an 8-step gameboy sequencer.

I think a stripped down and streamlined arduinoboy should be designed for mgb and gb303. The LEDs are not particularly essential and the arduino does have a dedicated spi port. I do think it should still use an arduino though, considering the price and availability. 

One mode, no button, four LEDs, spi connected to link port with timers and interrupts.

It does not have to be able to read cdrs before using the 007 method.
You cannot simply copy the contents from one card to the other.

If you had a card with freemcboot though, you could boot a USB drive with the elfs and perform a fresh install to a new card.

The ADC's voltage reference would not be set to 3.3v. That would require code modification and an actual 3v3 reference hooked up to the vref pin which is always hanging IIRC.