The games come out just under 6 days in Japan, and we know almost nothing of the plot of the game.
Here's a short summary of some of the stuff we know so far:
- Takes place in the Unova region 2 years after the events of B/W. New playable characters, new rival, a couple of new gym leaders.
- New locations: Aspertia City is where the player starts his / her adventure. Virbank City is the city where Homika has her gym. Sangi Forest is a forest connected with Keldeo / Cobalion / Terrakion / Virizion.
- Gym Leaders are Cheren [Normal], Homika [Poison], Burgh [Bug], Elesa [Electric], Clay [Ground], Skyla [Flying], Shizui [Water], Drayden [Dragon]. It is currently unknown if Iris returns as a version exclusive gym leader, but so far it's not likely.
- New formes for some legendary Pokemon: Tornadus / Thundurus / Landorus [Sacred Beast Forme], Kyurem [Black Kyurem / White Kyurem], Keldeo [Resolution Forme]
- Pokemon World Tournament is a tournament where you can battle past gym leaders and champions. Pokewood is the Pokemon Musical replacement, where the player can participate in Pokemon movies. Poketransfer makes a return from B/W.
- Fes Missions are a type of missions that can be accessed in the Extralink, once completed the player will get a reward. Join Avenue lets you connect with people over Wi-Fi / Wireless / C-Gear / Infrared to open up shops in a market, where specialized items with rare effects can be bought. Medals are some sort of accomplishment system.
As for what we know of the plot, Team Plasma has seperated into two teams (Team Plasma & New Team Plasma). New character, Akuroma, is apparently connected to Team Plasma. N's location is unknown to the old Team Plasma members and sages, though it is confirmed N (along with Zekrom / Reshiram) will confront Ghetsis (who is apparently controlling Kyurem) at some point in the game. Cheren is now a gym leader, Bianca is Professor Juniper's assistant, and Alder will make a return.
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ph33r teh masta~!