Saw something very odd last week.
Guy sitting in a cafe, by the window using a small 10" or under laptop. What was odd, is that it had a curved back, shiny black plastic with the Apple Logo smack bang in the middle. The curve to the lid looked akin to the iPhone back, but obviously larger.
Apple logo indeed looked lit, and I glanced at his screen and he was running OSX. He was deep in conversation on his phone, so I didn't bother him, and we were running out to catch a show.
But boy it looked different to what I've seen before, and first time I've ever seen anything that could even be considered a prototype out in the wild.
Few caveats though, he was in London (not well known for spying on Apple tech) and sitting in a cafe for all to see. He could be running his own hacked up machine also - or I could have had a extra-super-mega strength coffee and halucinated the whole thing.
Odd, and not saying I have anything confirmed/right or real - but thought I'd share