Not sure how many of you can read Japanese but this link is from Japan's main pokemon site and has a lot of release information that I haven't seen anyone here talking about.
There is addition of 3v3 battle, Rotation Battles, the Miracle Shooter, the PGL (Pokemon Global Link) and this Pokemon Dream World thing.
As for the actual game: I'm excited about the things that can be done over Wi-Fi and the addition of the computer as a main tool for game play. However the layout graphics of in game battles I don't really like (why is everything is odd octagons?) but the attacks look fantastic. They also removed having your first party pokemon follow you from what I can see from the images, =[
I also am excited about the Pokemon Musicals due to my job and how I like the contests from the older games.
http://www.pokemon-sp.jp/series/bw/#/pokemon/index.html