Ok, heres what I found out (not mine, it came from Bulbapedia.):
Black and White will be compatible with all five Generation IV games. While the full details are not yet known, transferring the shiny legendary beasts released to promote the thirteenth movie in Japan has been confirmed to unlock a Zoroark, and transferring a Celebi met in a fateful encounter will earn the player a Zorua. The games also have the capacity to connect to the internet; players can upload their save file and play online.
In addition to the improved graphics, a number of aesthetic changes have been made from previous generations, including an altered battle scene containing fully animated Pokmon battle sprites as well as a dynamic camera that changes focus to highlight specific parts of the battle. Also, when talking to people in select environments, like a Pokmon Center and Pok Mart, speech balloons for dialog will appear over people's heads.
Wow, it will be SUPER awesome!!!