First of, I was very surprised that N will actually appear in the BW series and to me this makes up for the series it lacked so far. Remember, we didn't get the whole Team Plasma arc when the earthquake happened a year ago and now we finally see Plasma at its best villainy. Colress and Ghetsis to me also makes up for it, my guess is that Colress and possibly N will battle Ash many times to see where his true strengths lay out of all the years we've all seen him as a whole character. As for the Charizard thing, I have a feeling that it IS his Charizard because of the promotions it kept showing for the past few months and it will probably have a strong rivalry with Iris' Dragonite. I think for once the writers might not troll us that there's a good chance that Ash will obtain a legendary (Zekrom) while he either battles N's Reshiram OR he could battle Ghetsis' Kyurem and does the whole absofusion thing with either his Zekrom or N's Reshiram, IMO resulting in Ash will fulfill the role of the Hero of Ideals.
Either way, it's gonna be fun to watch for sure and Team Rocket returning? Oh god, I hope they don't go back to their silly ways. Since there was a showing of Genesect, I have a feeling either Ghetsis will use it or Colress will.