Serebii has more info on the up coming Diamond and Pearl games.
So far this is what is known.
Set in new area (Good)
No new types (Thank goodness)
New type combos, like Steel/Fighting.
New pokemon.
Old Pokemon. (Please have Pidgy, and Rattata)
Pre-evos and Evos of Existing pokes.
Tradable with Ru/Sa/Em/LG/FR (Yay, Shiny Chinchou can come with me.)
The DS wireless, will be able to have 16 people at one.
Oh, and it's only on the DS.
clicky 