I recently found out that the site I'm getting this news from has Forums, so I'll summarize it for you...and also give some of my thoughts. This is all from the latest issue of CoroCoro:

-First of, returning characters. It's confirmed that Alder is back; no specifics, but I would assume he's still the Champion. Bianca is back as Professor Juniper's assistant, and apparently she's the one who gives you your starter. Cheren is back...as the new Normal-type Gym Leader...apparently the first Gym Leader you face. (This is a serious demotion...)

-Also, it looks like Team Plasma is back, but they still don't know where N is. Could lead to some interesting story developments...

-Apparently there's going to be something called the Pokemon World Tournament, which has "every Gym Leader and Champion from every region" fighting each other. I'm going to assume that the player can enter this, which causes my mind to be blown. You get to fight ALL of them?! The only way that could POSSIBLY be better would be if they included Red and the other past player characters!!

-It looks like Black and White 2 will be introducing a Pokemon version of Hollywood. Apparently it will literally be called "Pokewood." What the heck. Did we really need this? At all?

-Apparently the magazine discusses the Pokemon AR searcher, which will be a new 3DS app that can be used with Black and White 2 to catch new Pokemon. (Black and White 2 are DS games, but if you choose to play them on the 3DS, they can connect to the AR app.) Apparently this app involves a "Professor Burnet". I guess this is the new Pokewalker/Dream World thing. Might be cool.

-Also, the Kami trio have new formes! Their original forms are referred to as "Kenshin Formes," and the new formes are referred to as "Reijuu Formes." From what I can see of these new formes so far, the Kami are freed from their clouds and take on more animal-like appearances. Landorus is cat-like, Tornadus is bird-like, and Thundurus is dragon-like. I hope that they will either be easier to catch, or you can trade over your old Kami and then transform them, because it took WAY too long to catch Thundurus, and I still haven't gotten the others...

-There's some mention of the Japanese Keldeo and Meloetta distributions. The Meloetta will be level 15, holding a PP Max, and knowing Round, Quick Attack, and Confusion. Dearly hoping Keldeo gets distributed in America around when Black and White 2 are released...I need a good Water type...

-There's also some news dealing with the Pokemon anime and TCG, but I stopped caring about those long ago. Sorry, but if you want to read up on this info, you'll have to find it somewhere else.