You know that lherre is a developer with a dev kit, right? If he's saying it's more powerful, that's probably because it is.
We also heard lots of things about the 3ds before it came out.
And yes in the end, it's powerfull, but for reasons and features, it's not achieving that type of graphics people were excepting. That's just how Nintendo works i fear...
Now to counter my words, regarding the next consoles, i was also saying some time ago that i was certain there would be some kind of level of power that would just allow for a tricked next gen look. I was using Battlefield 3 as exemple for diminishing returns, or even The witcher 2. Take the PC version maxed out. Take the 360 version. Let's say it's a 10 and a 4. My idea was that it would just take a.. let's say, 6, to have something clean enough so people wouldn't see a big dif. I don't know if i'm clear. And i think for exemple, if one of the brand goes for a 6, when the other goes for an expensive house burning 10, the later will be loosing cause the higher cost won't be visible enough.
On that basis, i would have love Nintendo to go for that 6, but knowing them, and how they will use the resources they have to make lots of funny things to differentiate themselves, the console will end with a 6 for power, but a 5 for graphics, just a tad less than what it needed to be in the dudebro race again.
Now if BG knows things, ok, i would like to believe him.