Photos as promised.
Top of board showing the Arduino shield header holes (mirror imaged because the shield goes on the other side) and the holes for the Quub backplane connectior (the 2x17 rows at the bottom). This can have standard stackable type socket strips or right angle headers to connect to a solid backplane or a standard 34-way ribbon cable.
Also, near the backplane connector can be seen a 1x5 header, this is designed to connect directly to most (probably all) 4D Systems LCD/OLED displays so it's easy to add a touch panel to a project.
Back of board showing the temp sensor chip and the 512kB SRAM. Also the Arduino header holes as this is the side that Arduino shields plug into.
The front panel, USB socket, 2x user buttons and LEDs, access to the internal program and reset push buttons and a 7-segment display for diagnostics or my favourite idle task, show a lost ant display.
Also there are indicators that show if the CPU is connected to the Quub backlane or the Arduino shield with the I2C and SPI buses.
So this is supposed to be compatible with an Arduino Mega but with only the same shield connections as a Duemilanova/Uno etc. The other pins on the Mega2560 CPU are used for Quub stuff like the backplane, LED display etc. As there aren't many Mega shields around I don't see this as an issue, and in return you can address up to 15 Quub shields as well as any normal combination of Arduino shields
Of course we don't have any Quub shields yet, but that's another story.