On Serebii they now have this info on D/P for the DS. Info was found in this months Coro Coro mag.
New Area
New Poke
Pre-evos & Evos
No new types, but New type Combos (Steel/Fighting)
Trade with Ru/Sa/Em/LG/FR (Yay, my shiny Chinchou can come with me)
Up to 16 people linked with the DS wireless.
clicky