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I don't understand how this board only "uses 2 pins". The schematic shows the ezLCD component still uses 7 pins for I/O. Using the SPI bus requires 4 pins and the other 3 are presumably for the touchscreen sensing. The board still has the full Uno footprint, so you could connect other stuff to those pins at the same time, but you couldn't do anything with them while driving the LCD.

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There is a PIC24f that does all the graphics processing, and the arduino talks to it through serial. the spi connection is used to program the atmel . the other connections are optional for use like a interrupt on touch .

Dallas 1-wire? Haven't looked at the schematic or anything else, but that's an example of an interface that just requires 2 connections - signal and ground.

That's not what this uses.

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