Well there's a small section at:
http://www.psypokes.com/pd/index.php
Apart from showing some of the new pokemon that will be on D/P there isn't much there.
And I found some info on Serebii.net:
# They are set in a region different to Kanto, Johto & Hoenn but contains old Pokémon aswell as the new ones
# You are capable of transferring your hard trained Pokémon from Ruby, Sapphire, Emerald, FireRed & LeafGreen to these games
# There will be many new Pokémon including new Pre-evolutions and Evolutions of Old Pokémon. Currently 5 are known
# D/P will use the DS's Wireless Capabilities and allow for up to 16 Players to be linked at once in a Union Room style situation
# There will be no new Pokémon types but new type combinations such as Steel/Fighting
-Tails07
