I have some news about Pokemon Platinum:

1.- Volkner leaves the gym and someone else takes his place and possibly he (Volkner) will be new champion (like Wallace in Emerald)

2.- The Underground now will be playable via Wi-Fi

3.- There will be something similar to the Battle Frontier, called Battle Island

4.- There will be appearing Giratinas Origin Forme, Shaymins Sky Forme, and there will be appearing the recently announced Regigigas Flying Forme, also Shaymin wiill not need an event to be obtained, it can be obtained in the game without a Mystery Gift.

5.- I suppose you know about the next movie and that in Giratinas Pokedex entry its mentioned that hes from a paralell dimension; well, that dimension, called the Inverse Universe, will be part of the games plot and will be accessable

6.- Both playable characters will have a different outfit, the only known one is the males clothing, it will be a blue jacket and a silver bag.

7.- Cyrus will now summon both Dialga and Palkia at a time, and Giratina will be appearing in front of them

8.- Giratina, as you have noticed, will be the main part of the plot and all the game will be about him, probably Eterna City will have a Giratina statue instead of Dialga/Palkia; and probably the Turnback Cave will not be existing or it will be accessable but with no purpose except for training.

I have some photos to prove so:

Well, thats it for now