Pictures of the hardware:
It runs off a 12V 3.33A Power supply.
It looks like it might be possible to add a second network interface with a few parts and some soldering. Stay tuned! There is an internal USB-port that it's possible to use. Look at InternalUSBPort. There is already a serial port header on the board. Look at SerialConsole for more info and how to use it.
It appears that there is a space for a Mini PCI socket. It is unknown at this time whether it is possible to enable it.
The DS101J does not appear to have a JTAG port.