To be honest
To be honest, for the kind of duties I see this device being put to I'd rather have an iPad with one of those Bluetooth keyboard cases.
Sure the iPad doesn't run OS X (well it does but that's an argument for another time) and there's no finder, but by using goodreader as a file manager I could get along fine within the remit of what I would expect to do with the new MacBook.
I'm sure the new MacBook has it's market, but even as a long time Apple user I'm not in it.