ECU Block Diagrams
The microcontrollers are on a small module that plugs into a socket on the IO boards.
The first microcontroller module will be a stm32f4 and most likely followed by a MC9S12XDP512.
STM32F429NI http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1577/LN1806/PF255172#
Same pinout as the soon to be released STM32F756NG http://www.st.com/web/catalog/mmc/FM141/SC1169/SS1858/LN1902/PF260794#
There are three IO board versions. 1-2Cyl, 1-6cyl and 1-16 cyl.
This way the same IO boards are used with any microcontroller and software project.