I can tell you that when I worked for Sony, I left a few weeks ago, if anyone did have access to a XB1 dev kit, they were very quiet about it. And I think it's likely that I would have heard at least second or third hand.
For the most part the first definitive info we got on XB1 was VGLeaks stuff, just like everyone else. We certainly did get leaks from 3rd parties, for example confirming the RAM amount, and suggestions that we would have an advantage in compute, but I doubt any would be stupid enough to give Sony an XB1 devkit. I would assume that the same would be true on the other side of the fence.
I just don't think the risk for that sort of industrial espionage is worth while, by the time your competitor has real devkits available, your not going to be able to respond in any real way, so what's the point.
I would suggest as others have stated, panello was just stating that the obvious Flop advantage doesn't necessarily translate directly to a similar performance gap.