It's a con!
Come on, don't you all realise that this giant pad is just a stalking horse to keep others (Microsoft) investing into laptop-sized screens without keyboards?
Holy crap the 9.7" is plenty big, just hold it a few inches closer, which is what "shop staff" do already. And who wants to man- or woman-handle these big things around, anyway?
Apple are quietly laughing at all the bozos dancing around this idea.