I'm in the process of thinking about making a bitbox micro, cortex m0-based console. The idea is to be smaller, cheaper and maybe more challenging to write games than bitbox, while retaining enough similarity to keep experience and be able to port games simply. Original Bitbox will still be the bigger brother with USB, high def vga, expandability, bigger memory & faster core.

So far the design choices are :

• when in doubt, prefer small, cheap and simple
• stm32f0, 128k flash /16k RAM chip - 48MHz
• VGA out, jack for sound
• nunchuk controller
• USB for reflash and power
• around 1x2 inches
• a few megs SPI flash chip (no microsd since it adds to the price)

stay tuned !