remember those pics of early PS controller prototypes? they all look cheap as hell.
I think that pic does fit with what we've heard: no more B&W, + two shoulder buttons. That it would keep the remaining button layout is only logical, mustn't alienate the people.
The length of the cord would, IMO, corroborate the authenticity, rather than put it in question: if someone had built a fake controller out of carved soap bars, they'd just have stuck a plain vanilla Xbox controller cable on it... on the other hand, if you're prototyping lots of controller desings, you dont need that length of cable, just enough to hook it up, play with it a bit, see if it feel good and works. than just two it on the focus group table. 9 feet of cable would just be in the way.
It could well be legit, but as it goes with those things, it could only be a preliminary esquisse. Even if it's real, I dont expect the ffinal product to lok exactly like that