Maybe 'the brick' is an external box that provides extra slots and a DVD/optical drive and maybe the hardwire ethernet port and power with as has been said before, also perform 'dock like' functions like video, modem and more USB interfaces.
It would make sense.
Apple seems to be on a bent witht he 'Air' and not having much in the way of ports. If you remember the original Mac and Fat Mac, you see no slots, no ports and no expansion. The 'Air' seems to be a step back to that past?
That seems to be the only reason for 'the Brick'. Some kind of external device. How much do users actually use the DVD drive? I find that aside from the ease of having it built in, not having it wouldn't be a huge issue, as long as I can hot-plug 'the Brick' in when I need it and detach it when I don't. Hey, how about 'the Brick' also containing more battery capacity.
That would be cool. One thing that I loved about my HP notebook is that I could (and did) but a clip on battery that nearly doubled the runtime. I could learn to love 'the Brick'...
sorry to burst everyones bubble but for the nth time the brick is a tablet. The word brick just comes from a mistranslation from what ever was said in Chinese.