Yes, Mad Catz provided the actually firmware for the M.O.J.O, and in theory, it should be possible to pre root it and flash this thing.
But atm, the only known way to flash the firmware is the update tool on the device.
You can boot into the recovery, but only to the "lying android with exclamation mark". Haven't found a way to enter the recovery menu.
If your flash goes wrong, the recovery would be the only way to bring the device back in a working condition.
Rebooting to the bootloader didn't seem to work. Since the device has no external buttons to enter the mode. You can't even boot into a custom recovery to flash unsigned code.
I don't belive, that you can one of the external USB ports set from host to slave and that it will survive a reboot to access the device in recovery or bootloader.
They say, that the bootloader is open. But no one has provided any evidence about it.
Maybe you can catch the USB slave signal direct on the mainboard. But that would never be an option most would consider.
The device is advertised as "hacking friendly".
From Mad Catz side, till today there isn't released any documentation or tool to make it real.
Even the sourcecode of the device software isn't official released.
I really hope the things change to better in the next weeks.