I found this Pokemon2006.com. I just think I should give them credit.

Pokemon Zircon Is the third game out of Diamond and Pearl. (I was kinda worried about it being "Opal", then I would have to change MY name.)
Zircon Is different from the other third game versions. In this one the plotline will change. You'll notice in the older ones (Yellow,Crystal,Emerald) that the plot is almost the exact same with a couple exceptions. In this one Giratina will play as larger role in the game. For example, you'll be able to catch it BEFORE the Elite Four. This will make a big difference in how easy you beat the Elite Four AND its strange because Giratina is not supposed to be in your Pokedex until you have the National Dex. Only time will tell.
Another change! There is a new place called the "Challenge Area", which, you guessed it, is on the northeast island with all the other areas. This place has "simulation fights similar to XD"-
Pokemon2006.com.
There are also new Poketch applications.
The release date for Japan is Fall '07, and the US and UK release dates are unknown.
I'm willing to say that this is NOT confirmed, although I'm a strong believer in it.
EDIT EDIT EDITY'know, I'm really pissed off now. Turns out the game was an Apil Fools joke, but I'm just gonna leave it up....