I just saw a patient of mine. He's in the film/TV industry (he does audio work). He dislikes the 5D & 7D because he's not fond of the audio that comes off them but he does what he has to because that's his work.
In any case, for a few visits now, we had been talking about Canon cameras because he saw a photo of my son posted on my operatory wall taken with my 7D. So to kill time during our procedures, we chat about stuff.
He just told me he just came from a commercial shoot and now they've got a new camera out. He said they shot the entire commercial with a "D9". But I think he meant "9D" because he also referred to my camera as the "D7". But allegedly it's from Canon. He said the camera looked smaller than the 7D (physical size).
So we'll see. I don't know of any other specs, I have no photos. Just that it's reported to be a little smaller in size than the 7D (and even then, that may or may not be true).
Like any other rumors, take it with a grain of salt. But there might be a 9D announced some time later this year if they're already using it to shoot commercials.