Pokémon Black & White (be warned: spoilers)

[Maxpphire]

Zekrom's Signature move is Cross Thunder while Reshiram's is Cross Flame. If you use one after the other one has been used, the power of each move is increased and it is used automatically.
Victini has a new exclusive move called Fire Platform which can cause a burn. However, this move isn't in Victini's level-up and is learned via a different method. It attacks everyone on field
Emonga has a new move called Eleci Ball (エレキボール) which has a higher power based on your speed compared to your opponent's speed
Dream World
Different wild Pokémon will appear in different areas of the Dream World. For example you can find Aerodactyl in a sky area and other Pokémon near lakes. This is done in a place called Dream Island. You can even play if you don't have Black & White!
Makomo will loan you her Munna so you can access the Dream World
There are numerous mini-games within the Dream World for you to participate in and if your results are good, the Pokémon you played with will befriend you and be willing to be sent down to your main games
You can trade items with other players in the Dream World

Characters
A Plasma executive, and the guy we've seen in numerous trailers is called Geechisu ゲーチス

N uses Choroneko while Aloe is weak to Chaobuu as she focuses on Normal-types

Miscellaneous
There is an option to battle straight away on the main menu
The Transfer Machine with PokéShifter requires DS Download Play which will link into your Diamond, Pearl, Platinum, HeartGold & SoulSilver games. This is different from the PokéShifter and allows you to get the beasts and Celebi over to access Zorua & Zoroark. You need to select the words "Everyone Happy Easy Communication" to get it to work (みんな　ハッピー　かんたん　つうしん）) This is done in Hiun City
Zorua is to be found in a building in Hiun City while Zoroark is found in a new area called Illusion Woods. It can only be obtained once