I'm sure Brooke Burgess has a better idea of what's going on than we do, but some of his claims have actually been disproven. For example, Iwata himself said that the Revolution is not going to be doing 3-D projection. If you think about it, that really doesn't make sense given what Nintendo has said.
And I think the secret peripheral that was shown behind closed doors at last year's E3 was simply the microphone.
Now, there's another guy releasing info who sounds much more credible. I'd copy his posts for you, but there are too many of them and they are way too long. Just
read this thread at N-sider for more. You'll see him being quoted as Aries.
A couple interesting points are that the controllers are wireless and have gyroscopes and are pressure sensitive. I don't know what that last part means, but I'm guessing how hard you squeeze the controller has an impact.
And apparently the Revolution Online will include downloading demos, message boards, communicating with your buddies and chat rooms...all absolutely free. That could be quite something if they pull it off, and it's only what Nintendo has been saying they would do for a long time.