I find it hard to believe there'll black plastic + aluminium casing, as well as 16:9 screens. I think it'd be more probable if it was a switch to LED and to a new size together, however, 13.3" LED backlit screen in Air makes me doubt it. Any change of that kind would've to be planned for a long time, and if they planned to do so, would they really have designed a completely new product with "old" size? Not to mention all that advertising of full-size screen and eco-friendly aluminium casing? Or maybe I just hope it's not true (really, 16:10 is about as flat as I can accept).
I agree this guy had good sources judging by the amount of the correct information about the nano, however, his sources might have been misinformed now - if only to check where the leak is. He didn't say precisely whether he talked to people who had seen the new computers, or whether he talked to those who didn't, but believed other employees did. And if that is the case, it would also make "the brick" rumor less reliable. Of course, it's also perfectly possible all of this is true - but then, I really want it to be false, so I refuse to believe it for now 😉.