AMS, I suspect you'll find those two 50 pin solder pad areas at the bottom are more likely to be a bus implementation so that the hardware can be tested or added functionality can be 'easily' added by plugging in another card - like the lart+kitchensink board. There does appear to be an internal USB header, so internal USB devices is a very good posibility.
Gee, I had just gotten used to having all my disc drives inside my computer, I guess with this system we should expect to see a return to the good old BBC micro days - cables to the tape deck, cables to the floppy drive, cables to the 2nd processor and any other device you have plugged in, and power supply cables for them too, I just loved a my cluttered desk and miss it sooo much
If these are developer machines, we should not expect final shipping product to be identical as feedback is collected and fixes/requests are ammended. I don't know if I am too spoiled, but I would not expect a computer manufacturer to produce a computer system (even budget concious A9 design) and not give the user a removable media drive bay so that they can load software into their new toy. Surely the industry isn't going to take a giant leap backwards and expect new users to know what peripherals they need buy with a new computer? We're all going to be so busy telling people not give up on thier new A9, just go out and spend more money and plug something useful into it. The DVD drive in the mac mini makes it bigger, sure, but a whole lot more practical from a users perspective - I can load software patches as soon as i get it and keep it running healthy