Plus, with the screen removed the "brick" is presumably a computer in a keyboard form factor, just like in the good old days.
This also sounds like a new series of monitors which Apple probably won't do until they can have LED backlights in the big screens.
Right now the best I can do is to carry an external keyboard. But it's a pain to have to tote around redundant hardware. Of course, it's also a pain to be in pain after spending too much time using an un-ergonomic laptop.
Now drag the menu bar to whichever screen you like. And remember, Google is your friend.
The common alternative, some sort of configuration wizard with 1,000 controls, seems worse. But only just.
OK, it's not a huge advantage, but it's neat.
Only downside: unless they're very clever with the design, a brick-keyboard isn't as good to type on as a regular keyboard. But hey, maybe they'll be clever with the design, so it tilts downwards properly.
Hmm, and I just thought of another nice way to use it: on my lap, on the couch, plugged into my big-ass TV.